How does the oil level sensor work on a Mercedes Benz?
The engine oil levels in the oil level sensor (S43) and in the oil sump are balanced through the bore (c). The bore (c) is opened or closed by a bimetal snap plate (8). The bimetal snap plate (8) opens from an engine oil temperature of 60 – 70 °C and closes at an engine oil temperature of 30 – 40 °C .
Where can I get a Mercedes Benz oil light?
Here is the Sender you need>> Mercedes R129 W140 URO Sender Unit With 2-Pin Connectors 0095420817 | eBay << , you probably find it even cheaper by a couple of bucks ,not worst the effort .
Why does the oil light come on but go away?
It now seems that the OIL LIGHT stays on when doing highway speeds but seems to go away when im driving around the city with stop and go. I think the mysterious oil leak is leaking on that oil sensor (wherever that is). Thoughts? Also, where is the ENGINE OIL sensor exactly located.
When does the low oil light come on?
But you cannot lose anything if you search for bad wires. Thats your low oil indicator, that light will come on when the engine oil is low but will go off after a short time, just enough to let you know its low. Then will return on and off until you top it off.
The engine oil levels in the oil level sensor (S43) and in the oil sump are balanced through the bore (c). The bore (c) is opened or closed by a bimetal snap plate (8). The bimetal snap plate (8) opens from an engine oil temperature of 60 – 70 °C and closes at an engine oil temperature of 30 – 40 °C .
Why does my oil gauge keep going bad?
If installing a thicker viscosity oil raises the oil pressure, then something major is wrong inside the engine. Besides, modern cars are designed to use very thin oil anyway. Gauge Problem vs Oil Pressure Problem Dashboard gauges do occasionally go bad, but it is very rare.
Where do I find the oil pressure gauge?
Locate the oil pressure sending unit on the engine (the parts store can sometimes tell you where it is), remove it and follow the instructions that come with your universal oil pressure gauge to hook it up. Then drive the car and see what the gauge does.
Why is my oil pressure reading so low?
There are rare mechanical problems that can cause an unsteady oil pressure reading. They usually happen right after an engine has been overhauled. Advertisement If that sounds like you, then suspect a faulty oil pressure by-pass valve or spring inside the oil pump. Valves stick or can get installed wrong on some engines.
Where is the oil pressure sensor located on a Mercedes Benz?
The gauge in the instrument cluster gets its signal from the oil pressure transmitter located on the lower part of the oil filter housing. If you are having unusual or no readings from the gauge the first and easiest thing to replace is your oil pressure sender.
Why does my oil gauge read low when I start the car?
So the first few seconds after starting the engine the gauge reads very low. It’s probably accompanied by some loud ticking noisesfrom inside the engine. Then the gauge suddenly shoots upward to normal and the ticking noise stops. You have the wrong oil filter installed.
Locate the oil pressure sending unit on the engine (the parts store can sometimes tell you where it is), remove it and follow the instructions that come with your universal oil pressure gauge to hook it up. Then drive the car and see what the gauge does.
Why is my oil pressure reading so erratic?
Contrary to popular thinking, using an engine oil that is too thin will not make the gauge reading erratic on an engine that is in good mechanical condition. If installing a thicker viscosity oil raises the oil pressure, then something major is wrong inside the engine.
When does an oxygen sensor fail in a car?
As vehicles grow older, there comes a point when the oxygen or air/fuel ratio sensor’s heater circuit will probably fail. When that happens, the easiest fix is to install a new sensor. But when the vehicle comes back two days later with the same heater code, what then? A local shop called me in on just such a case.
How to diagnose O2 sensor heater circuit failure?
The modified test harness with the light will give you easy access to the circuit. Remember, the engine needs to be running at this point. If the voltage is close to zero on the positive heater wire, then locate the open circuit in the power wire back to the fuse. Again, it may have a relay in the circuit as well.
How does a diagnostic trouble code work on a car?
While you are driving your vehicle, its computer is constantly monitoring and running tests on the various sensors, actuators and electrical parts that make the car run properly. If a problem is detected, a Diagnostic Trouble Code (DTC) is set, and the computer turns on the “Check Engine” light.
How many oxygen sensors does a Mercedes Benz have?
Once you scan your car, you will get a fault code that directs you to the faulty oxygen sensor, for instance, Bank 1 Sensor 2. Which sensor would that be? There are usually four oxygen sensors on your Mercedes-Benz.
Why is the NoX sensor on my Mercedes not working?
These codes indicate that the NOx sensor A (for U029D) or B (U029E) is not communicating with the other control modules in your Mercedes. The most common reason for failure is a circuit fault. If you experience this issue, you should get it checked out as soon as possible, as the PCM will no longer be able to check emission levels.
What should I do if my O2 sensor is not working?
Then clear the codes. Some computer systems will shut the O 2 heater circuit off until the codes are cleared. Now, with the ignition switch off, plug the test harness with the light into the vehicle’s O 2 sensor harness connection. The light should remain off until the engine is started.
Where is the OBD 2 Scanner on a Mercedes Benz?
Here are the bestseller OBD 2 scanners on Amazon and any of these will work fine. Your OBD II port where you plug in the scanner is located under the dash, usually right under the steering wheel. You can see an example in the picture below. Step 2: Locate the defective oxygen sensor.