Engine Codes without Service Engine Light on

Apr 15, 2004 2 Replies
D

Does anyone know if the computer on the OBD II (96 Chev. Lumina, 3.1 engine) maintains trouble codes without throwing the Service Engine light coming on? My car sometimes runs a little rough but the Service Engine light hasn't come on. I just wondered if the OBD II stores codes for some problems and when it hits a threshold, it causes the Service Engine light to come on. I just thought about the O-2 sensor, etc. The car has 92k miles on it.



Thanks and I appreciate any thoughts on this matter.



David


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J

There are also pending codes. Not quite enough out of the norm to set the Service Engine Soon lamp.

So yes, they can be read by a scan tool.

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B

Yes, it does.

That's what happened on my 2003 Malibu. Turned out the engine was mis-firing and had a clogged injector.

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