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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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#1650 of 1656 Re: Check engine light [slogan5] by Mr_Shiftright HOST Oct 01, 2009 (2:56 pm)
Replying to: slogan5 (Oct 01, 2009 2:25 pm) Well tell them to turn the light off at their expense and see what happens. It only takes them a few minutes. See if you can get a code # for us.
#1651 of 1656 Re: Check engine light [slogan5] by kiawah Oct 01, 2009 (2:57 pm)
Replying to: slogan5 (Oct 01, 2009 2:25 pm) They need to read, and then clear, the error codes. They may not have fixed the original problem, but did a couple obvious first steps to see if they could have an impact.   If the error doesn't clear, it can stop you from passing inspection if that is one of your state requirements.   Take it back now. If you wait much longer they will treat it as a 'new' problem, and charge you for diagnosis time.
#1652 of 1656 1998 civic "Check Engine" by rcross Nov 07, 2009 (8:58 am)
O2 sensor replaced by Honda dealer. "CE" came bak on. Independent mechanic replaced bosch plugs with NGK. I checked. They are correct type. "CE" came back on. Engine misses at idle. The code indicated catalytic converter. Still a third mechanic replaced the plug wires which made it run like new except for the stumbling idle and now "CE" back on (probably for the cat converter again).    Will get code checked soon. Have you seen this before? Thank you. Replies to this message: Mr_Shiftright (Nov 07, 2009 9:02 am) srs_49 (Nov 09, 2009 10:13 am)
#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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