What is the fault code for fuel trim?
OBD II fault code P0170 is defined as “Fuel Trim Malfunction (Bank 1)”, and is set either when the PCM (Powertrain Control Module) experiences difficulty in controlling/maintaining the ideal air/fuel mixture, or receives a fuel trim request from the post-catalytic oxygen sensor that exceeds the PCM’s ability to adjust the fuel trim to meet the …
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 does it mean when your fuel trim says p0173?
P0173 means there was a malfunction in the computer’s control of the air:fuel ratio. It also indicates that the fuel trims reached their limit of adding fuel while trying to compensate for a actual or perceived rich condition.
What causes fuel trim values to be off?
However, even if the sensors are known to be good, it can happen that displayed fuel trim values may be off by as much as 20% or more; this can be the result of a malfunction, or, it can be the result of someone having recently cleared all fault codes.
What is the DTC 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. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $0.0.
What is the PCM error code for fuel trim?
When the fuel trim reach its limit, the PCM will set the error code, indicating a malfunction in fuel trims. It can also be the same malfunction but on Bank 2, which would be error code P0173. Symptoms for Error Code P0170 may vary depending on the make of the vehicle.
What does a negative fuel trim code mean?
This can be a negative or positive trim. This code means there’s a malfunction in the computer’s control of air to fuel ratio. This code can also mean the fuel trim has reached its limit of adding fuel while it tries to compensate for actual or perceived rich condition.
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.