P0401: This code signifies a reduced flow of recirculated exhaust gases into the intake manifold resulting from a faulty EGR valve. P0402: The EGR Flow Excessive Detected code means there is too much recirculated exhaust gas flowing through the system. P0403: When you see this code, your...
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1. Check Technical Service Bulletins:To diagnose the Check Engine code, the first step is to check for common known problems. Car manufacturers periodically issue Technical Service Bulletins (TSBs) that describe common problems for certain models. Some TSBs are posted on the internet; Google can h...