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Oxygen Sensor Question


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As many of you know, I'm currently in the last stages of repairing my head gaskets. Something I noticed when I had the car apart is how difficult it would be to replace the oxygen sensor on the rear bank, if it were to go bad. I priced these and they're about $30 for a Bosch. Should I go ahead and replace it while I have access to it, or is this a part that rarely goes bad? The car has 132k and is a strong runner (when it's assembled :lol: ) and the engine has never had any problems other than the head gaskets. Really clean inside too. I know I've heard here and there about people havin these go bad, but is it really a common occurence? Also, will the car run abnormally if one were to go bad and weren't replaced? :huh:

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