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Check Engine light

1656 messages,  Last post on Nov 10, 2009 at 6:37 PM

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What is this discussion about? Fuel System, Electrical, Engine

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#1653 of 1656 Re: 1998 civic "Check Engine" [rcross] by Mr_Shiftright HOST Nov 07, 2009 (9:02 am)
Replying to: rcross (Nov 07, 2009 8:58 am) I've certainly seen hundreds of 02 sensors replaced needlessly because the "mechanic" doesn't test the old one for the voltage value range.
#1654 of 1656 Re: 1998 civic "Check Engine" [rcross] by srs_49 Nov 09, 2009 (10:13 am)
Replying to: rcross (Nov 07, 2009 8:58 am) I'm betting the code was something to do with catalytic converter efficiency? If so, that's sort of an indirect measure of the cat in that the algorithm compares the outputs of the front O2 sensor(s), which are in front of the cat, to the output of the rear O2 sensor, behind the cat. So, the problem could be with the other O2 sensor, the one that maybe wasn't replaced.   Though, misses at idle may mean the engine is dumping unburnt fuel into the exhaust, and hence into the cat. I think that can kill a cat pretty quickly.
#1655 of 1656 Infrequently by euphonium Nov 10, 2009 (3:47 pm)
the CEL goes off and on while at highway speeds. It is a '94 Town Car, 145000 miles and runs great otherwise. What could be causing this? Replies to this message: kiawah (Nov 10, 2009 6:37 pm)
#1656 of 1656 Re: Infrequently [euphonium] by kiawah Nov 10, 2009 (6:37 pm)
Replying to: euphonium (Nov 10, 2009 3:47 pm) Take it to someone to check. Impossible to remotely diagnose that problem over the internet with that listed as the only symptom.

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