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Originally Posted by ManoNegra
O2 sensor can easily go bad. Running rich can destroy them as well as a small amount coolant in the gas. 02 sensors, like anything, don't last forever.
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I know. I replaced O2 sensor on my S13, but went to Mazda dealership and everyone said they never sold MX-3 O2 sensor to anyone, and not to worry about it. It was odd...