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Do not get one from a wrecker...
An old O2 sensor makes your engine run slightly richer. That is, they read a little bit leaner as they age. How do I know? My old oil burning car chewed through O2 sensors very quickly, and towards the end of the sensor's life the exhaust had a noticeable unburned fuel smell.
It's 25 freaking dollars, just buy a new one.
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