O 2 Sensors - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 5 (permalink) Old 08-05-2012, 05:25 PM Thread Starter
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O 2 Sensors

are O 2 sensors hard to change?
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post #2 of 5 (permalink) Old 08-05-2012, 05:36 PM
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I know the down stream is easy on an SS. Just undo the sensor and follow the cord and unhook it from the connector and reverse. I'd assume the upstream, the one in the header is about the same just tighter spot to work in(?).

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post #3 of 5 (permalink) Old 08-05-2012, 05:39 PM Thread Starter
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how do I know which one is bad? if my check engine light isn't on?
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post #4 of 5 (permalink) Old 08-05-2012, 05:40 PM
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If you can get it scanned it should tell you depending on the scanner.

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post #5 of 5 (permalink) Old 08-05-2012, 09:41 PM
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If it needs changing it should give a code.

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