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Discussion Starter #1
What are the O2 sensor codes that say which sensor to change? I need to know all of them.
Front upstream & downstream
Rear upstream & downstream
I'm not just gonna buy all of them or try to guess which one needs to be replaced.
 

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What are the O2 sensor codes that say which sensor to change? I need to know all of them.
Front upstream & downstream
Rear upstream & downstream
I'm not just gonna buy all of them or try to guess which one needs to be replaced.
what trouble shooting steps did you perform before coming here ?
 

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Discussion Starter #4
I was asking for a friend. She took her pilot to a "pre-smog" place to find out if there are any necessary repairs needed before paying for a smog. They said the sensors had not turned on and there was a red "X" next to the O2 sensor. That was all the info I was given.

Problem Fixed
Apparently the vehicle had been sitting a couple months and SOMETHING (I dunno know what) had to be reset. The car had to run for 40 miles and all the codes went away. The check enginelight went off. Feel free to comment if you know more about this so us dummies learn something new from this experience.
 
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