QuestionQUESTION: Hi, I recently went in and had a diagnostic done as my "check engine" light was on and was told that I needed to replace my EGR valve (the fellow said it was the UFO looking thing), however, when I was researching whether I needed to replace it or just clean it and if I could do it myself, a fellow said that it may be the BTP that needed replacing instead. I don't have the cash to fix both problems so what should I do?
ANSWER: Hi Melodie -
Out of curiosity, can you tell me what number that code was?
Thanks
aloha
calvin
---------- FOLLOW-UP ----------
QUESTION: I believe it was either 0400 or 0401... something like "EGR valve malfuntion"... sorry I can't remember exactly...
AnswerHi Melodie -
Sorry, i have no information on BTP, however infor on the EGR is below:
A code P0401 most likely means one or more of the following has happened:
The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
There is a blockage in the EGR (tube), 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 & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
Clean out the EGR valve and/or tubing to remove deposits
Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
Replace the DPFE sensor (with a good quality / OEM one)
Replace the EGR valve
Hope this helps -
aloha
cal
