Question about 2002 Jeep Liberty
I have a 2002 Jeep Liberty Limited with 97000 miles. Recently the check engine light came on with a code of P0174 and I took it to a mechanic. They said it was the o2 sensor and replaced it. It ran fine for a couple days then the problem returned with same code. Took it back and they said it was a faulty MAP sensor (it was full of oil) and the o2 sensor. After they fixed it, a mere 10 miles of driving later the light came back on and the same code. Took it back for a third time and they said it was the o2 sensor again and that they replaced it with the actual Jeep part. It worked fine for a little over a week and now the engine light is back on with the same code. Any ideas?
Can't tell you exactly what is wrong but the one thing you said is of concern...Map sensor should not be full of oil. If it is, I'd want to know why. In finding the reason for that, you may also find the reason why you are having a problem.
Jeep uses two kinds of engine crank venting. you either have a pcv valve or an orifice controlled system. If either are obstructed it can overpressure the crankcase and cause all kinds of problems.
Years of experience tells me this isn't something I can guess at and be 100% sure I have the right answer but based on what you said, I'd look there first!
Posted on Feb 07, 2010
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Posted on Jan 02, 2017
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