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how long does it take for a CEL to return
I had a check engine light a few months ago for a slow O2 sensor. I cleared the code, and it hasn't yet come back. But it looks as if the gallons per hour on my SG2 changes more slowly than it should. I'm not sure if this is due to that O2 sensor, or it is just my imagination.
So, how long should it take for a CEL to return if the underlying problem isn't addressed. And should my MPGs jump up and GPH jump down when I take my foot off the gas, or is it normal for it to slowly change.
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