Hi, just pulled the code from this vehicle, 2000 Gr. Caravan 3.8L 4spd auto148Km, and it comes out as P0401(Exhaust Gas Recirculation Flow Insufficient Detected). Wondering if anyone knows of any specific issues or parts I should look at or test before replacing parts. Engine runs fine, had a slight hiccup when idling last 5 days before light came on. I was waiting for the light to see what code would show up.
What does that mean? 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 P0401 code means that OBD detected an insufficient amount of EGR.
Symptoms You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.
Causes A code P0401 most likely means one or more of the following has happened:
a.. The DPF (differential pressure) sensor is faulty and needs to be replaced b.. There is a blockage in the EGR (most likely carbon buildup) c.. The EGR valve is faulty d.. The EGR valve may not be opening due to a lack of vaccuum Possible Solutions In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
Thanks maxpower, its pouring rain right now so I guess it's a trip to my local dealer tomorrow for parts, what about this differential pressure sensor, is that the transducer you mention.?
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