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videosmithla
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videosmithla
April 2021 | 2 Replies
I am at my wits end with this check engine po401 exhaust-gas recirculation and differential pressure. I have replaced the EGR valve and within a couple of miles it came back on. I have a OB2 reader and cleared it but failed the smog test in Ca because it didnt drive through a full cycle. I went to my mechanic and he suggested I replace the EGR selonoid which I did and then cleared the code. Again it came back on. I then read that the culprit could be the DPFE sensor that is part of the EGR family. I replaced and then added Chevron with techron and drove it down to San Clemente on the freeway. It didnt turn back on but my wife called me the next day and was driving in Laguna and it went back on-WTF!!! I have spent 200 bucks in parts and its still not fixed. I work on complicated computer programs but still cant figure this one out. Anybody have any suggestions because the next step is the Ford dealership and I dont want to spend alot on this truck as it is so old but has been reliable up until now
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