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1990 'vert, L-98. Won't idle. Downloaded(?) the codes. They are: H41, C41, H72, and H74.
I can find all the code definitions on other websites, except the H74.
So, what can you guys tell me about these codes? And, what do the "C" and "H" stand for ("cold" and "hot")?
So, what can you guys tell me about these codes? And, what do the "C" and "H" stand for ("cold" and "hot")?
Mike
It is one thing to get someone to tell you where the code originated, but quite another, to get the trouble shooting charts. The code is only the first step in the trouble shooting procedure. Just because an O2 went lean (or rich) doesn't mean that the O2 sensor is bad. It could have very correctly reported a mixture problem, that had an unrelated cause. Don't shoot the messenger. The money you spend on the FSM will be saved many times over, if only on the good parts that you would have otherwise replaced.