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2

Short answer, yes - a faulty O2 can make the Check Engine Light / MIL to go on. Do you know what the code is?


2

According to this website, the cat can surely be plugged by coolant entering the catalytic converter. Here are the reasons given on the website: Engine Tune-Up Required. A number of problems could occur to the catalytic converter as the result of an engine that is out of tune. Any time an engine is operating outside proper specifications, ...


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Is it normal to attach a catalytic converter using u-bolts? Or when i replace it should I have it welded? It is not normal to utilize u-bolts (muffler clamps) on catalytic converters. They are most often welded in place.


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Looking at the description of the California O2 sensor for your car, the only thing different on it (besides the internals) is the electrical plug. The wrench which you tighten it down with is 7/8", which means the sensor bung should be the same size as well. I don't think there is any real external difference between the California and non-California ...



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