This doesn't necessarily mean the sensor itself is faulty. The problem could lie elsewhere in the EGR system, such as:
* Une vanne EGR bouchée : Buildup of carbon deposits can restrict the flow of exhaust gases.
* Une fuite dans le système EGR : A vacuum leak in the lines or the EGR valve itself can prevent proper operation.
* Un capteur de position EGR défectueux : This sensor measures the position of the EGR valve and if it's malfunctioning, the PCM might register a low flow.
* A problem with the EGR cooler (if equipped): A blocked or malfunctioning cooler can restrict flow.
* Un PCM défectueux : Though less common, a problem with the PCM itself can also trigger this code.
To diagnose the P0402 code, a mechanic will need to perform a thorough inspection of the entire EGR system, checking for leaks, blockages, and verifying the functionality of all related components. Simply replacing the sensor might not solve the problem if the root cause is elsewhere.
