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Re: 93 9000 check engine
Posted by Steve B (more from Steve B) on Mon, 1 Apr 2002 18:36:00
In Reply to: 93 9000 check engine, eddie g, Mon, 1 Apr 2002 18:23:32
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The "Check Engine" indicator is almost always due to an expired O2 (Lambda) sensor. Since the O2 sensor puts out a voltage that is proportional to the O2 level in the exhaust, it is also possible that if the back pressure in the exhaust system is too high or too low the sensor will trip the light. This fault light can be reset by disconnecting the battery for a short period of time. If it takes a few miles for it to come back on, it is probably a bad O2 sensor. I'm not sure about the knock sensor tripping this indicator light.
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