I replaced the upper and downstream O2 Sensor, EGR Temp sensor, Sensor on top of the EGR Valve, and cleaned the EGR Valve real good. i still have the engine light on after reseting. They told me to check the VSV but in this car i have 3 VSV installed on top of the engine. i need to know what else i can do to solve this issue...
Thank you ACE
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52 is a faulty knock sensor signal. The connection there may be loose or broken. 71 is an EGR temperature signal fault. Again the connection may be loose, or the EGR temp sensor faulty, or the EGR vacuum switching valve faulty.
This can be caused by a variety of problems: - very dirty air cleaner element- incorrect ignition timing- emissions system faulty (EGR valve blocked)- fuel injection system faulty (pressure relief valve blocked)- MAP sensor failed- throttle position sensor faulty- coolant temp sensor faulty- air temp sensor faulty
For most of these a trouble code should be available to steer you in the right direction. Is the check engine light flashing a code?
First did you reset the computer after replacing the EGR valve if you don't the computer doe'nt reconize the new sensor so it doe'nt reset the peremiters.Then check all passages and lines in the intake manifold there could be a clogg somewhere.Go to www.rockauto.com and you'll find EGR pressure sensor for under $30.00.
P0401 OBD-II Trouble Code Insufficient 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.
P1410 EGR Valve Position Sensor Circuit Malfunction
You may have to replace the sensor. If you get a chilton manual at an autoparts store, it will show you how to test the sensor with some test values in the book. The book should run about $20
If you have a P0401 code from a CEL, the first thing is to check the EGR vacuum modulator. It is a little well usually next to the EGR. Pop the cap off and dust the little sponge inside. Sometimes this gets stuffed up with carbon particles and causes recirculation problems. You should clean the tubes hooked to it while you are there. Reset the code and see if the light comes back.
Replacing the EGR is not a tidy job. It is an expensive part to replace and you will disconnect the three hoses and dismantle it from engine by two nuts. Save it for the later if the previous trick fails to work.