I am performing a diagonstic in car trouble shooting by checking the check engine light. I have two codes that keep coming up the first code is 12 and the second code is 21 which has to do with the O2 I am performing a diagonstic in car trouble shooting by checking the check engine light. I have two codes that keep coming up the first code is 12 and the second code is 21 which has to do with the O2S. My car is a 96 chrysler sebring convertable. Where is the oxygen sensor located? I need to check it out.

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O2 sensors are screwed in to the exhaust. There should be one before the catalytic convertor to help the computer determine fuel strategy and one after the catalytic converter to monitor cat. conv. efficiency. Follow the exhaust and you will find them. By the way code 12 means you entered the diagnostic mode code 55 means you finished the cycle.
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