What does service engine soon light mean and what causes it?
Yes, Low engine oil level can cause the service engine soon light to appear on your dashboard on a lot of car models. It can also mean that other low fluid levels are low or other problems with the car. It is relatively easy to check the oil level, though, so you should definitely begin with it. Founder, owner & main author of Mechanic Base.
Why does my check engine light not light up?
If your Check engine light is ON, the easiest way to diagnose this problem is to always check your trouble code memory with an OBD2 scanner. The check engine light will not light up if there is a scheduled service as the service engine soon light.
What to do if your engine maintenance light goes out?
Check your engine control unit for any stored trouble codes. If you receive any codes, save them and try to get information about what they mean. If there are codes for emission problems that are not dangerous for your engine, you can try deleting the code to see if the engine maintenance light goes out.
Yes, Low engine oil level can cause the service engine soon light to appear on your dashboard on a lot of car models. It can also mean that other low fluid levels are low or other problems with the car. It is relatively easy to check the oil level, though, so you should definitely begin with it. Founder, owner & main author of Mechanic Base.
If your Check engine light is ON, the easiest way to diagnose this problem is to always check your trouble code memory with an OBD2 scanner. The check engine light will not light up if there is a scheduled service as the service engine soon light.
Check your engine control unit for any stored trouble codes. If you receive any codes, save them and try to get information about what they mean. If there are codes for emission problems that are not dangerous for your engine, you can try deleting the code to see if the engine maintenance light goes out.
How to reset service engine soon light Paul?
What You Will Need 1. Turn the Ignition to the ON position 2. Press the Accelerator in Quick Succession 3. Release the Accelerator 4. Press and Hold the Accelerator 5. Release the Accelerator 6. Turn OFF the Ignition 7. Start the Car Method 2 1. Disconnect the car battery 2. Drain the Remaining Power 3. Wait for Fifteen Minutes 1.
What to do if service engine soon does not go off?
If the light does not go off, try buying and installing a new gas cap. They cost less than $10 at your local car parts retailer. It is worth ruling out this common problem before proceeding to bring in the vehicle for an expensive service call. It Wasn’t the Gas Cap? Uh-oh!
What does SES mean when it says service engine soon?
Some car SES warnings simply say “engine” or they use slightly different words like “check engine” or “service needed.” Note the exact phrase and the color of the light (usually red, orange or yellow) when talking with your mechanic. If the SES light is red, your car’s problem is serious.
How to clear service engine soon light 1990 to 2002 Chevy?
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If the light does not go off, try buying and installing a new gas cap. They cost less than $10 at your local car parts retailer. It is worth ruling out this common problem before proceeding to bring in the vehicle for an expensive service call. It Wasn’t the Gas Cap? Uh-oh!
When does the service engine soon light come on?
If your Check engine light is ON, the easiest way to diagnose this problem is to always check your trouble code memory with an OBD2 scanner. The check engine light will not light up if there is a scheduled service as the service engine soon light. It does only occur when there is a problem with your engine.
What does the service vehicle soon ( SVS ) warning light mean?
It’s different than the “Service Engine Soon” light or check engine light. The Service Vehicle Soon (SVS) warning light is part of a computerized monitoring system that’s run by the body control module (BCM). The BCM keeps an eye on several systems non-engine systems throughout the vehicle’s body and chassis.
What You Will Need 1. Turn the Ignition to the ON position 2. Press the Accelerator in Quick Succession 3. Release the Accelerator 4. Press and Hold the Accelerator 5. Release the Accelerator 6. Turn OFF the Ignition 7. Start the Car Method 2 1. Disconnect the car battery 2. Drain the Remaining Power 3. Wait for Fifteen Minutes 1.
What does it mean when your engine light is flashing?
Most often the engine light is not flashing, but when the engine light is flashing, it means that the problem with the engine occurs right now at the moment and it’s a more serious problem like a misfire. The Engine control unit is all the time receiving values from all the sensors of the car engine.
Why does my check engine light keep going off?
The check engine light blinking then goes off, the condition is referred to as soft failure or intermittent. This problem usually occurs when there is a specific condition, such as a broken wire, which connects and disconnects, causing the light to go on and off.
Where does the Check Engine light come from?
The check engine light, service engine soon, or malfunction indicator lamp is part of your vehicle’s onboard diagnostics system. The system is run by your vehicle’s computer, which is known as the electronic control module (ECM). Nowadays, the electronic control module operates virtually every electronic or electrical system of your vehicle.
What does the service engine soon light mean?
Service Engine Soon Light Meaning. The service engine soon light means that there is a minor problem with the electronics or the engine of your car. Some manufacturers are using it as a Check engine light for minor issues.
What does it mean if the Check Engine Light is flashing?
A flashing check engine light means that the problem occurs at the moment and it’s most likely a more serious problem like a misfire. It’s not recommended to drive with the check engine light flashing or ON. The problem is most likely a misfire, combustion or a faulty engine sensor problem.
What does service engine light mean?
The Service (or Service Engine) light is a warning light that is connected to the engine control unit (ECU) of a vehicle. The ECU is the brain of the car and monitors a number of systems, including: Emissions: There are sensors throughout the engine management system on all cars manufactured since 1996…
Why would my engine light come on?
Officially known as a malfunction indicator lamp, the check engine light can go on for a number of different reasons. In some cars, something as simple as a loose gas cap, which the car’s computer can read this as a leak in the emissions system, or even a change in humidity can cause the light to come on.
How to diagnose service engine light for free?
Check engine light on? Here is how to use an OBD-II scanner for free to diagnose the service engine light & save money vs a mechanic fee. Menu Home About About Contact Categories Investing Banks CDs Dividends ETFs Finance Guru Commentary Index Funds Inflation Market Terminology Mutual Funds Stocks Wall Street News Lifestyle Finance Biking Donating
What to do if your car dashboard warning light is still flashing?
Avoid heavy acceleration and high engine speed and stop the vehicle. Restart the engine after 2 minutes to reset the engine management system. If the light is still flashing, turn off the engine and contact us to report your breakdown.
What to do when check engine light comes on?
The whole purpose behind the Check Engine or Service Engine Soon light is to alert you to a minor problem before it becomes a bigger issue. While you don’t need to immediately pull off the road and have your vehicle towed when this light comes on, you should schedule an appointment to have it fixed right away.
What should I do if my car dashboard light is not working?
How to solve it: Start by checking all the fluids in the engine bay. Check the oil level, transmission fluid level, brake fluid level, washer level, etc. You should always check that all your lights on the vehicle are working properly. If everything is ok, you should check when the latest service was done and if it’s time for a new service.
What are the signs on the dashboard of a car?
This list covers general symbols that appear in the most common car models. 1. Engine/Check Engine Warning Light 2. Service Engine Soon Warning Light 3. Battery / Alternator Charging Warning Sign 4. ABS / Brake Control Warning Light 5. Airbag/SRS Warning Dashboard Light 6. Washer Fluid Level Warning Sign 7.
Is the service engine light a Dirty Little Secret?
Money Saving Products I Use Search The Service Engine Light: Your Mechanic’s Dirty Little Secret Last updated: January 16, 2021 G.E. Miller214 Comments Troubleshoot the Check Engine Light]
Money Saving Products I Use Search The Service Engine Light: Your Mechanic’s Dirty Little Secret Last updated: January 16, 2021 G.E. Miller214 Comments Troubleshoot the Check Engine Light]
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When does the oil service light come on?
Typically, when you start off your engine, the oil service oil should come on for about two seconds then it stops. If this light stays on, it will mean your vehicle needs oil or filter change.
Why does my oil service light keep blinking?
It also needs to have a computer which counts the number of miles you cover at specific intervals and gives you a notification of oil change when necessary. After using your vehicle for some time and you see the engine light blinking, it tells you to change the engine oil or the filter.
When does the Check Engine light come on?
The check engine light is coming up when the engine control unit or the transmission control unit has detected a fault in the engine or transmission system. If your Check engine light is ON, the easiest way to diagnose this problem is to always check your trouble code memory with an OBD2 scanner.
What are possible causes for service engine soon light?
- Loose gas cap. This is one of the most common causes of the service engine indicator light to go on.
- Spark plug issues. Spark plugs are an essential part of the combustion process in your engine.
- Malfunctioning oxygen sensor. Oxygen sensors monitor the levels of oxygen in the gas that is leaving the engine.
- Faulty Mass Airflow Sensor.
How can I Reset my service engine soon light?
- Locate the diagnostic port under the dashboard.
- Connect your OBD2 scanner to the diagnostic port.
- Turn on the ignition and turn on your scanner.
- Select Read Codes from the main menu.
- Write down the code (s) and do further research to understand what each code means.
What makes a service engine soon light come on?
- the engine control module (ECM) and power train control module (PCM) perform a series of checks of the
- Stuck Thermostat
- according to 2CarPros.com.
- Epilogue.
Why does my “service engine soon” light remain on?
There are a lot of causes of why the service engine soon light comes on. The most common cause is that your car has a minor engine issue, low fluid level, a faulty light bulb, or a minor emission issue depending on the car model. Can I drive with service engine soon light on?
Do you know how to reset service engine soon?
If you own a car, it is important to have the general knowledge on simple car repairs. You may find yourself in an emergency, and the problem may require a simple solution that can be solved in less than five minutes.
What does “service engine soon” message mean?
The “service engine soon” warning lights up on your car dashboard to alert you to a problem with your car. You or your mechanic can use a specialized computer scanner or code reader to diagnose the issue. Generally, if the light stays lit for at least several minutes at a time, this means you need to schedule a checkup for your car. Types.
What should I do if the oil service light is on?
An engine requires a constant supply of oil typically when moving for its parts to get lubricated. Driving on without addressing this issue might cause serious damage to your car engine. When you see oil service lights popping on, take the necessary action to safeguard your vehicle.
How much does a service engine soon cost?
The savings can be tremendous after a couple of “service engine soon” light incidents. The initial cost of a mechanic’s visit will start at $100 just to get the error codes from your car’s onboard computer. Add a couple hundred for labour and inflated costs for parts, and your mechanic is happy to see you every time.
Check engine light on? Here is how to use an OBD-II scanner for free to diagnose the service engine light & save money vs a mechanic fee. Menu Home About About Contact Categories Investing Banks CDs Dividends ETFs Finance Guru Commentary Index Funds Inflation Market Terminology Mutual Funds Stocks Wall Street News Lifestyle Finance Biking Donating
How long does it take check engine light to turn off?
Depending on the type of code set, the Check Engine light might turn itself off after a few drives. The system performs a self-test, and if it passes enough tests, it’ll turn the light off itself. In some cases, you can clear your car warning lights yourself simply by disconnecting the battery for 10 to 15 minutes.
Why does my service engine soon light come on?
Numerous manufacturers can include a mileage countdown on the car, which will then automatically set-off the service engine light to alert you to bring your car into your mechanic. If your service engine light comes on, a lot of times it could be related to either the air filter, the cabin filter, or the oil service.
Why do I need a check engine light?
Also – if you’re not already doing it, bringing your car in for regularly scheduled maintenance is a very important aspect of car ownership, and can help cut down on unexpected Service Due/Service Engine Lights. The Check Engine Light will usually show the outline of an engine.
What does the warning light on the dashboard mean?
Your owner’s manual will tell you how. If the light still shows, turn off the engine and contact us to report your breakdown. If the warning light’s on when the oil level’s right, there’s a problem with the oil supply. That could be caused by the oil pump or a blocked oil filter.
When does the Check Engine light turn on?
The orange, engine-shaped icon on your car dashboard’s instrument cluster is programmed to turn on when the vehicle’s electronic brain detects something is wrong.
How to reset service Engine Soon ( SES ) light?
Press and Hold the Accelerator Place your foot on the accelerator and press it in, but this time, do not release, hold it there for ten seconds. During this step, the SES light will start to flash. 5. Release the Accelerator Release the accelerator pedal after the 10 seconds and see the engine light still blinking. 6. Turn OFF the Ignition
What happens when you see service engine soon light on your dash?
The initial effect of seeing this little light on your dash is to scare the living gezebbes out of you. Immediately, you assume the worse and fear that you must spend hundreds or thousands of dollars to “fix” your car.
When does the service due light come on?
The computer system tracks the engine miles from the time it was reset, and the light will trigger after a certain amount of miles add up. The system is set to trigger every 10,000 miles.
Press and Hold the Accelerator Place your foot on the accelerator and press it in, but this time, do not release, hold it there for ten seconds. During this step, the SES light will start to flash. 5. Release the Accelerator Release the accelerator pedal after the 10 seconds and see the engine light still blinking. 6. Turn OFF the Ignition
How does the service in light work on a Hyundai?
A message, “SERVICE IN”, will appear each time the ignition is switch turned to the “ON” position. The computer system tracks the engine miles from the time it was reset, and the light will trigger after a certain amount of miles driven (i.e. 5,000 miles, or 7,500 miles).
What’s the difference between a check engine light and a service light?
The simplest explanation for the difference between a check engine light and service light is the former indicates a major problem and the latter indicates a need for maintenance or regularly scheduled service. Identifying the Service light is a lot easier than most of the other symbols you might see next to your instrument cluster.
Where can I get a check engine light repaired?
As always, when you need either routine service called for by a service light or diagnosis and repairs in the event of a check engine light on your European car, Autoscope European Car Repair is here to assist you. Give us a call at one of our three great locations in Dallas and Plano, or schedule an appointment online today!
What’s the difference between a check engine and a service engine soon?
The Service Engine Soon Light is the equal to the Check Engine Light. A proper diagnosis for the Service Engine Soon should be performed to find out what is going on. A tune up may help but the Service Engine… The engine computer would need to be scanned to see if the engine is misfiring.
The check engine light is coming up when the engine control unit or the transmission control unit has detected a fault in the engine or transmission system. If your Check engine light is ON, the easiest way to diagnose this problem is to always check your trouble code memory with an OBD2 scanner.
What does the “service engine soon” light mean?
The Service engine soon light means that there is a minor problem with the electronics or your car’s engine . Some manufacturers use the service engine soon light instead of the check engine light when there is just a minor problem with your car and not a severe problem.
What means service engine soon?
What does service engine mean?
Some manufacturers use the service engine soon light instead of the check engine light when there is just a minor problem with your car and not a severe problem. It could also mean that it is time for a scheduled service, such as oil or spark plug replacement .
What should I do if my car sputters when starting?
Fuel that is. The next time the vehicle sits, instead of immediately starting the engine, turn the ignition switch to the run position so the dash lights come on for two seconds and then turn the ignition switch off. Repeat this a half dozen times and then try starting the engine.
What causes a car engine to make a sputtering noise?
The car has a set of vacuum hoses that, with time, develop leaks. This will cause the engine to produce a sputtering sound when the air-fuel mixture gets too rich or too lean. 4. Dirty mass airflow sensor The combustion chamber requires the right amount of fuel and air.
What should I do if I see a service vehicle soon light?
Check the headlights with the high beams on and off. Check the turn signals and the flashers. Ask someone to check the brake lights while you step on the pedal, or back up near a wall where you can see them reflected in your mirror. Do the same with the backup lights.
The simplest explanation for the difference between a check engine light and service light is the former indicates a major problem and the latter indicates a need for maintenance or regularly scheduled service. Identifying the Service light is a lot easier than most of the other symbols you might see next to your instrument cluster.
This list covers general symbols that appear in the most common car models. 1. Engine/Check Engine Warning Light 2. Service Engine Soon Warning Light 3. Battery / Alternator Charging Warning Sign 4. ABS / Brake Control Warning Light 5. Airbag/SRS Warning Dashboard Light 6. Washer Fluid Level Warning Sign 7.
How to solve it: Start by checking all the fluids in the engine bay. Check the oil level, transmission fluid level, brake fluid level, washer level, etc. You should always check that all your lights on the vehicle are working properly. If everything is ok, you should check when the latest service was done and if it’s time for a new service.
Airbag/SRS Warning Dashboard Light What it means: This light means there is a problem with your Airbag / SRS control system. When this light is ON – the airbag control system is completely disabled, and you won’t have any airbags saving you in an accident. That’s why I always recommend fixing this problem as fast as possible.
What do I need to know about service engine soon?
A good battery test with a digital battery tester that provides current voltage, cold cranking amps, and state of health will either clear or condemn the battery…. For an issue like this, a certified mechanic will need to inspect the vehicle and determine exactly where the problem is located.
Why is the SES light not working on my car?
QDM or “Quad Driver Modules” control ground circuits in high amperage circuits in the computer. GM monitors the circuits to see if, for instance, the cooling fans are working or not. QDM faults affect operation but not emissions, so the SES light is not illuminated even though a code has been set.
What kind of smell is coming from the exhaust?
A smell is coming from the exhaust. Service engine soon light is flashing. Car is vibrating while in gear and in park. A smell is coming from the exhaust. 2008 Buick Lucerne CXL 6 cylinder.
What to do if your car has a strong fuel smell?
If you have a car from the 1970s or earlier, a lingering fuel odor after you turn off the engine might be normal; if that odor is strong, however, don’t wait to get it checked out. What to do: Pull over safely and turn off the engine immediately. Get your car towed to the auto shop.
As always, when you need either routine service called for by a service light or diagnosis and repairs in the event of a check engine light on your European car, Autoscope European Car Repair is here to assist you. Give us a call at one of our three great locations in Dallas and Plano, or schedule an appointment online today!
Why are there brake lights on my dashboard?
Some common brake lights that can show up on a dashboard include: This light is a warning that brake pads are getting too worn and should be replaced soon: If these lights go off and on repeated or when you turn, it can mean to check the brake fluid level in the master cylinder:
What’s the difference between service engine soon and service vehicle soon?
It’s different than the “Service Engine Soon” light or check engine light. The Service Vehicle Soon (SVS) warning light is part of a computerized monitoring system that’s run by the body control module (BCM). The BCM keeps an eye on several systems non-engine systems throughout the vehicle’s body and chassis. These can include:
Can a check engine light light up on a misfire?
If the vehicle is built prior to 1996, the computer may not pick up on the misfire and may not light the check engine light. If you would like to get in contact with a Mechanic, I recommend using Just Answer as they have Mechanics online 24 hours a day and can answer any questions that you may have.
What causes an engine to misfire in a new car?
7 Common Causes of an Engine Misfire 1 Bad Ignition Coil (New Cars) / Distributor (Old Cars) 2 Bad Spark Plugs 3 Intake Manifold Gasket Leaks 4 Low Fuel Pressure 5 Injector Problem 6 Low Compression 7 Wrong Air-Fuel Mixture
When to ignore a trouble code for a misfire?
When retrieving trouble codes, only consider related codes to a specific misfire problem, like an ignition coil failure code. If a trouble code is present and doesn’t pertain to the immediate problem like an EVAP code, ignore it until a later time, when the engine is running properly these codes could cycle out.
How to find a misfire in your Ford without a check engine?
How to find a misfire without a check engine light using mode 6 OBDII scanner. This will work with all 4.6L V8, 5.4L V8, & 6.8L V10 Fords. This test was done in a 2001 Ford Expedition 5.4L V8 Triton. Ford engine computers tend to not throw a check engine light even if it’s misfiring, and this is how to find it. Loading…
When does the reduced engine power light come on?
The reduced engine power light comes on when the vehicle’s computer detects a fault in any of the systems that allow the engine to run optimally, such as airflow sensors, throttle sensors and oxygen sensors.
What to do when reduced engine power comes on?
If you’re driving and the reduced engine power light comes on, the first thing you should always try to do is get the vehicle back home or to a shop immediately. If you’re already at home and the light comes on, don’t drive the vehicle.
The reduced engine power light comes on when the vehicle’s computer detects a fault in any of the systems that allow the engine to run optimally, such as airflow sensors, throttle sensors and oxygen sensors. This light isn’t found in all vehicles out there, nor is it always a light in the vehicles that do have this warning mechanism.
What does the reduced engine power warning mean?
Asking what engaged reduced engine power warning message is somewhat like asking what turned on your check engine light —there are too many possibilities to list. Plus, GM has changed its fail-safe strategies over the years, so exactly what can engage the message depends on the year and model of your vehicle.
If you’re driving and the reduced engine power light comes on, the first thing you should always try to do is get the vehicle back home or to a shop immediately. If you’re already at home and the light comes on, don’t drive the vehicle.
Why is my Check Engine light not working?
Reduced gas mileage and stalling can also indicate a MAF problem. A MAF for a late-model car typically costs between $120 and $150. An aftermarket alarm can wreak havoc on your car if it’s not installed properly. It can drain the battery, trigger the check engine light, or even prevent the vehicle from starting.
What to do if your car is stalling at the slip light?
In very rare occasions, the ECM has an internal failure. Checking for output signals at the computer will reveal if this is the case. This can also be tested at the sensor to avoid removing dash components. I suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts.
Why is my Check Engine light still on after filling up?
The cap is a crucial part of a car’s fuel delivery system. It notably prevents gasoline fumes from leaving the fuel tank, and it helps keep the whole system under the correct pressure. If your check engine light turns on immediately after a fill-up, pull over and make sure the cap isn’t loose — or still on your car’s roof.
In very rare occasions, the ECM has an internal failure. Checking for output signals at the computer will reveal if this is the case. This can also be tested at the sensor to avoid removing dash components. I suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts.
Where is the service engine soon light off on a BMW?
Here are the steps that you may be able to take to shut a BMW service engine soon light off: Find the odometer button that is situated at the bottom left corner of your BMW’s instrumental panel Release the button and then press and hold it down again until you encounter a message that says, “Reset?”
What causes the oil light to come on?
For the “Oil Light is on”, check the oil level before starting it again. If the oil level is low enough to cause the oil light to… You may be dead on about the CV joint, the car certainly does have enough miles on it for the joint to be bad. CV’s will respond to the torque load as well as changing direction, so your analysis is…
What could be wrong when the engine light comes on?
A loose fuel cap is one of the most common reasons why the check engine light turns on. The cap is a crucial part of a car’s fuel delivery system. It notably prevents gasoline fumes from leaving the fuel tank, and it helps keep the whole system under the correct pressure.
What to do when the engine light is on?
Check your gas cap. Especially if the light comes on shortly after refueling, pull over and check that your gas cap is tightly in place. This often solves the issue, though it may take several restarts of the engine to reset the light.
What happens when the Check Engine light comes on?
The Check Engine light — sometimes called the Service Engine Soon light or Malfunction Indicator Lamp (MIL) — is the computer’s way of communicating with you. When the light comes on, it’s telling you it noticed a problem with the way the car’s operating.
What does it mean when a car engine hesitates?
This is what it means when the car engine hesitates. It is usually the result of a problem with the air and fuel mixture within the combustion chamber. However, there is a long list of other reasons which could be the cause of this hesitation problem too.
Can a bad check engine light be a bad TPS?
The check engine light will randomly turn on and off even if the car is running smoothly without any jerks and stalling. This is often the first ever symptom of a bad TPS. Using a code reader, you should be able to confirm whether a faulty TPS is the culprit or a different component.
What happens if you have a flashing engine light?
Driving with a flashing engine light can result in more expensive problems with your engine. One example is if the car is misfiring/not running at all on one cylinder, and you keep driving for a long distance, you can either fill up the catalytic converter with fuel and destroy it.
This is what it means when the car engine hesitates. It is usually the result of a problem with the air and fuel mixture within the combustion chamber. However, there is a long list of other reasons which could be the cause of this hesitation problem too.
The check engine light will randomly turn on and off even if the car is running smoothly without any jerks and stalling. This is often the first ever symptom of a bad TPS. Using a code reader, you should be able to confirm whether a faulty TPS is the culprit or a different component.
Why does my Buick Lucerne hesitate when accelerating?
Dirty fuel injectors may cause the engine to run lean which will in turn, cause hesitation when accelerating. A top-rated mobile mechanic will come to your home or office to determine the reason why your vehicle is hesitating while accelerating.
Why does the engine control module take so long?
The engine control module performs all engine components tests at each engine ignition and after the vehicle has warmed up. If it has failed a test several times, it will determine something is not as it should be. Therefore, it can take a long time for the engine control module to detect these problems.
What causes the knocking sound coming from your engine?
What causes the knocking sound coming from your engine? There are several answers to this question, but there is one that is particularly common: a bad air/fuel mixture. Your engine depends on two primary ingredients in order to fire and create the power that propels you forward: oxygen from the air around you, and fuel that can be ignited.
Why does my car make squealing noises when I start the engine?
A lot of engine noises do come from low engine oil or other fluids. Always start by checking the engine oil level with the dipstick if you hear any noise. The other most common thing is a bad serpentine belt which can cause squealing noises. Remove the serpentine belt to see if the noises disappear.
What should I do if I hear engine knocking?
If the problem persists and you continue to hear engine knocking, however, schedule an appointment for engine repair with your local auto mechanic at Christian Brothers Automotive. Let them take a professional look. Check your fuel octane level. Low octane can cause engine knocking.