What causes a fuel trim malfunction in a Mercedes?
Potential causes include a vacuum leak, unmetered air leaks Fuel saturated engine oil Leak in turbo air charge hoses (if equipped) Possibly bad O2 sensor (If Mercedes, may require adaptation with M-Benz compatible scan tool.) Oil contamination in MAF connector or O2 sensor connectors.
What is the diagnostic code for fuel trim malfunction?
P0173 is a diagnostic trouble code (DTC) for “Fuel Trim Malfunction (Bank 2)”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
What does it mean when your fuel trim code is p0170?
In writing this article I’ve added Mercedes-Benz-specific info since it seems that M-B (and VW) are most prone to having this P0170 surface along with misfire codes or other fuel trim codes. P0170 means there was a malfunction in the computer’s control of the air:fuel ratio.
What causes a Mercedes Benz to have a p0170 code?
P0170 and P0173 Code Causes The most common cause of P0170 and P0173 on a Mercedes-Benz is a defective mass-airflow sensor. The MAF sensor gets dirty over time triggering the CEL and the two codes.
Potential causes include a vacuum leak, unmetered air leaks Fuel saturated engine oil Leak in turbo air charge hoses (if equipped) Possibly bad O2 sensor (If Mercedes, may require adaptation with M-Benz compatible scan tool.) Oil contamination in MAF connector or O2 sensor connectors.
P0173 is a diagnostic trouble code (DTC) for “Fuel Trim Malfunction (Bank 2)”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
In writing this article I’ve added Mercedes-Benz-specific info since it seems that M-B (and VW) are most prone to having this P0170 surface along with misfire codes or other fuel trim codes. P0170 means there was a malfunction in the computer’s control of the air:fuel ratio.
Why do I keep getting Mercedes Fault codes?
Most of the time these Mercedes-Benz fault codes are caused by a defective Mercedes Mass Air Flow Sensor (MAF) sensor. You can try cleaning the sensor but that doesn’t always work. It is best to replace the sensor. If the codes remain it is possible you have a vacuum leak.
Cost of diagnosing the P0170 code. P0170 is a diagnostic trouble code (DTC) for “Fuel Trim Malfunction (Bank 1)”.
What does Bank 1 fuel trim malfunction mean?
Error Code P0170: Fuel Trim Malfunction (Bank 1) Error Code P0170 is described as Fuel Trim Malfunction Bank 1. This means the PCM (powertrain control module, also known as ECM or engine control module) has detected a fuel trim outside the specified range set by the vehicle’s manufacturer.
Cost of diagnosing the P0170 code. P0170 is a diagnostic trouble code (DTC) for “Fuel Trim Malfunction (Bank 1)”.
P0170 and P0173 Code Causes The most common cause of P0170 and P0173 on a Mercedes-Benz is a defective mass-airflow sensor. The MAF sensor gets dirty over time triggering the CEL and the two codes.
How does the fuel gauge work on a Mercedes Benz?
I would check the fuel level sensor that Chris mentioned. The sensor is a variable resistance inversely proportional to the level of fuel and ranges from roughly 5 ohms (empty) to 70 ohms (full). You access the contacts of the sensor by removing the cover shown in the picture.
What are the warning lights on a Mercedes Benz?
The following are warning lights and indicators found in vehicles built by Mercedes Benz. Click a link to learn more about each one. They are roughly ordered by importance, which tends to be by color (red, amber, yellow, orange, green, blue, gray), but there are over 40 of them so be patient!
How do you get the fuel flap out of a Mercedes?
Use a flat blade screwdriver or an upholsterey tool and get under the center pin and pop it out work the paneling out front to back just a little further than the filler area.
How does the fuel pump work on a Mercedes S500?
The Mercedes-Benz S500 is part of the S-class series of luxury sedans. An important component of the S500 is the fuel pump relay, which turns on the fuel pump when the engine is turned on and powers down the engine when the ignition is shut down.
Where is the fuel pump relay on a Mercedes?
The fuel pump relay is located within the inner structure of the vehicle, however, once accessed, it allows owners to tighten or replace the component as needed. Ensure that the Mercedes-Benz engine is turned off. Examine the rear compartment area on the passenger’s side of the trunk area. Unscrew the bolts of the trim panel with a socket wrench.
What kind of meter does Mercedes Benz use?
Older style meters used on fuel injection systems in the 1980s measured air volumetric flow, which worked fine but then you also needed a separate sensor to figure out how cold or dense the air was.
Why do I have a fuel trim code of p0173?
For most lean and rich conditions, the ECM can compensate for the lack or air or gas entering the engine. However, if the amount of compensation is too much, a P0173 code may set. Fuel trim is what the ECM implements to adjust the air-fuel ratio of the engine according to changing driver conditions.
What does fuel trim mean on an ECM?
Fuel trim is what the ECM implements to adjust the air-fuel ratio of the engine according to changing driver conditions. The air-fuel ratio should stay at, or very near to 14.7:1.
What should bank 1 fuel trim be at idle?
If long-term fuel trim (LTFT) for bank 1 is 25% at idle, but corrects to 4% at 1,500 and 2,500 rpm, focus on factors that cause a lean condition at idle, such as a vacuum leak.
How many bank are there in an inline four cylinder engine?
Since inline four cylinders only have one bank, the one bank they do have is considered bank 1. But inline six cylinder engines may have two banks (3 cylinders per bank) even though the engine is an inline configuration.
What causes the throttle body on a Mercedes to fail?
When there are throttle body malfunctions the wrong amount of air enters into the engine causing problems with air/fuel mixture ratio. Here is a close up picture of a Mercedes throttle body. Mercedes throttle bodies made by Bosch and VDO may fail. Luckily these units are repairable.
What are the trouble codes for Mercedes Benz?
P2009-002 M16/6 (throttle valve regulation part) practical potentiometer 2,signal voltage too low. P200A Component N15/3 (ETC control module) is faulty. P200B Component N15/3 (ETC control module) is faulty.
What is the diagnostic code for secondary air injection?
P0410 is a diagnostic trouble code (DTC) for “Secondary Air Injection System Malfunction”.
What causes a Mercedes Benz to run out of air?
P0410 MERCEDES-BENZ Possible Causes. Faulty Vacuum hoses damaged. Faulty Air Pump inoperative. Air bypass solenoid harness is open or shorted. Air bypass solenoid circuit poor electrical connection. Air bypass solenoid leaking/blocked or stuck open/closed.
What does secondary air injection system malfunction mean?
Error Code P0410 – Secondary Air Injection System Malfunction. Error Code P0410 is described as Secondary Air Injection System Malfunction. This means there’s an issue in the vehicle’s emission system, and can be caused by either electrical or mechanical failure.
When is the p0410 Mercedes-Benz code detected?
Most auto repairs shops charge between $75 and $150 per hour. When is the P0410 MERCEDES-BENZ code detected? The secondary air injection system does not detect the presence of air in the exhaust when introduced by the secondary air injection system. An air pump is used on the vehicle to lower tail pipe emissions on start-up.