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You are watching: 2002 cadillac deville check engine light


Guys im having a problem with my 02 deville. About a month ago i pulled my car out of storage it had been sitting for about 6 months. Well since i took it out its been giving me problems. The check engine light turns on and about a week later it will turn back off. I notice it has a mis fire now and the check engine light turned back on. I changed gas the oil filled it with coolant all the minor shit. and its still acting up. The trouble codes i got out of it were p171 and p174. Maf sensor or engine mis fire is what the codes were telling me. Has any one had this problem. Please Help!!!!
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P0171 - Fuel Trim System Lean Bank 1P0174 - Fuel Trim System Lean Bank 2 You most likely have a ripped plenum causing a vacuum leak. Rather common on the 2000+ Northstars. The plenum is the rubber coupler between the TB and the manifold. Do a search for plenum. It"s been discussed many times. There are even a few threads with pictures.
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It may, or at least feel like one. Spray some Brakleen under the plenum, that"s where the rip will be and see if the RPM"s rise.
Is this a part i can get at the local auto parts. Or is it a dealership part. Or if worse comes to worse junk yard.

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