My exhaust tip is black from soot. I believe the engine is running very rich. Is there anything that would be causing this, and how do i correct it. Is it possible to lean it out and get better gas mileage? Thanks.
get a new o2 sensor, if yours is lazy it will make the car run rich and probably won;t throw a check engine light.
recomended replacement for heated o2 sensors is 90-100,000 miles, 50-60,000 for non heated sensors
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