Question about 1996 Isuzu Trooper
Had a diagnostic check on my 1996 Isuzu Trooper after the check engine light came on. was due to a catalytic converter. still running smoothly & was told it would probably take a while to affect anything. I wanna fix it now regardless. any way to attempt to clear the problem without replacement? thanks Ramon fromTN
Without knowing the specific code, I will assume it relates to an inefficient catalytic converter. At this mileage it could very well mean that the catalytic converter is failing to do it's job and needs to be replaced. The computer sets this code when it sees a signal from the rear O2 sensor start to change in time with the front O2 sensor. It should not. If the cat is working, The rear O2 sensor should have a stable output as the cat is supposed to be removing all the oxygen from the exhaust. Sometimes this code will set if the spark plugs or the engine's state of tune has deteriorated and is producing more emission than the cat can handle, the rear O2 sees the overflow and assumes the cat is bad.
At your present mileage, I would strongly suggest changing the spark plugs if they have not been done in the last 20,000 mi. Have the light reset and drive it to see if the code returns. If it does, replace the catalytic converter. I suspect that you do need a cat, but I view the spark plugs as maintenance, and I wouldn't want to put a brand new cat in without the assurance that my old plugs were not going to damage the new one.
Hope this helps,
Posted on May 19, 2009
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Posted on Jan 02, 2017
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