02 Sensors - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-07-2009, 10:19 PM   #1
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I get both of the codes and is it necessary to change both o2 sensors, the bonnie runs fine, a while back #6 plug wire was shorting out to the o2 sensor. Should i change the upstream one first and see what happens? thanks
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Old 07-08-2009, 01:14 AM   #2
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Change the top one first, clear the codes and see what happens.
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Old 07-08-2009, 08:11 AM   #3
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Just do the front sensor. The rear one should be just fine. If your still getting a code after you change the front, then you can deal with the rear one.
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Old 07-08-2009, 08:39 AM   #4
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Interesting that you have two codes. One for the front and one for the rear. Both heating circuits.

I spent 2 minutes googling the code and reading GearChatter'* DTC stuff on it. Which BTW is the fsm.

Says to start by checking the fuse for the O2 sensor circuit. The key being you have more than one code and it'* more than one sensor. Stepping back for a moment, it makes sense that if a fuse blew and they are both on the same circuit, they'd both push codes.
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Old 07-08-2009, 12:12 PM   #5
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Please add your year and trim of your vehicle to your signature line. That way when you start asking questions in other areas of the forum, we all have a better idea on how to assist you. Click on "Quick Links" above, go down to "User Control Panel" and then click on "Edit your Signature" It'* pretty straight forward from there.
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Old 07-08-2009, 11:26 PM   #6
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Where in the heck is the o2 sensor fuse?
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Old 07-09-2009, 08:12 AM   #7
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I dunno ...that'* one fuse I never had to check. (literally probably the one and only)

Check the diagram on the fuse panel and the owners manual. If you have no luck, holler up and I'll try and remember to check an fSm when I get home.
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