![]() ![]() What makes P0401 code tricky to diagnose, or any EGR system code for that matter, is the different system configurations in used today.įor this reason, you want to have the vehicle repair manual for your particular vehicle on hand. One of them is failing to reroute enough exhaust gases back into the intake manifold, which triggers the P0401 trouble code. Just like any other system, the EGR may fail in many different ways. The EGR (exhaust gas recirculation) system is in charge of recycling a controlled amount of exhaust gases back into the cylinders to reduce combustion temperatures and thus, reduce highly toxic oxides of nitrogen (NOx). In other words, the computer knows there's a problem in the EGR system or passages but doesn't know why. Basically, a P0401 code means the car's computer has detected insufficient exhaust gas flowing back into the combustion chambers. ![]()
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