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How do you know if you have a bad O2 sensor?

You can use an OBDII scanner to determine which of the four O2 sensors is bad.
 

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No, you can purchase one for as low as 0 bucks. The better ones go for 100 and up. I purchased one from AutoZone and it works fine, even resets the codes for you.

You can go to AutoZone and they will read the codes for you for free, no need to go to the dealer.

You can get sensors from Nathan Crabtree (http://www.discountbritishparts.com/) for a bit over 100 $

Good luck.
 
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