P0402 Exhaust Gas Recirculation Flow Excessive Detected
Technical Description
Exhaust Gas Recirculation Flow (EGR) Excessive Detected
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen.
There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor (DPF). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0402 code means that OBD detected an excessive amount of EGR.
Symptoms
You may notice drivability problems such as the engine may surge off idle. There may also be other symptoms.
Causes
A code P0402 most likely means one or more of the following has happened:
Possible Solutions
With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor.
Related EGR codes: P0400, P0401, P0403, P0404, P0405, P0406, P0407, P0408, P0409
More Information
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"Delete Error Code Permanently, Disable DTC Error Code Function for p0402 in the ECU"
In extreme cases, we even have the option to permanently remove the specific DTC p0402 and disable the function of the specific error code in the ECU. All other fault code functions will then continue to work to protect the engine. This is different from clearing an error code with a diagnostic device. We have the option to permanently remove the function of the specific error code, so that it never comes back. Also emergency running that occurs on the specific error code can be solved in most cases.
Of course we prefer to first try to solve the cause of the error code, but sometimes the only solution is to permanently disable the DTC function of p0402.
