P0401 OBD Trouble Code
Technical DescriptionInsufficient EGR Flow
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.
SymptomsYou 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.
CausesA code P0401 most likely means one or more of the following has happened:
The DPF (differential pressure) sensor is faulty and needs to be replaced
There is a blockage in the EGR (most likely carbon buildup)
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum
Possible SolutionsIn 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.
Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's. There should be a noticable difference in RPM's with the EGR open
Clean out the EGR valve to remove deposits
Replace the DPF sensor
Replace the EGR valve
Some Tracs have an extended warranty on the DPFE sensor. Check with your dealer, have them do the inspection while they're at it.
Probably wouldn't cost more than $100 to change both parts.
Below is a good link.
Buy a scangauge (www.scangauge.com).
Don't be afraid to change mechanics.