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Re: Need Help With Check Engine!
Depends which o2 sensor it is. The first one (closest to the engine, in o2 sensor housing) regulates fuel for a warmed up car... so that makes it pretty important. I think if it goes bad, your car will revert to a pre-set fuel table by MAS signal, and you'll get bad gas milage. It's not good to run the car off stoich in the long run.
If it's the cat o2 sensor, it won't affect anything.
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