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Cobra Forums
The Terminator
Engine/Tuning
O2 Sensor codes after tune
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<blockquote data-quote="RealBadDude" data-source="post: 5597241" data-attributes="member: 59315"><p>data log it</p><p></p><p>drive while logging/watching the O2's. see if they are moving or changing voltage. be sure to check all 4. this will isolate it to either a specific failed O2 sensor, or a larger problem.</p><p></p><p>my worry is that if it happened right after a tune, then maybe the tune is bad and your car is running lean. If that is the case, the behavior should be the same on both front O2 sensors. </p><p></p><p>keep in mind the rears are after the cats so they should show right about the middle, maybe .5 to .8 volt range. (assuming you run cats)</p><p></p><p>if both front o2 sensors show this stuck lean, then ithink you got a bad tune because i doubt they both went bad at the same time. </p><p>if you are lean the rear o2 sensors should show lean as well.</p></blockquote><p></p>
[QUOTE="RealBadDude, post: 5597241, member: 59315"] data log it drive while logging/watching the O2's. see if they are moving or changing voltage. be sure to check all 4. this will isolate it to either a specific failed O2 sensor, or a larger problem. my worry is that if it happened right after a tune, then maybe the tune is bad and your car is running lean. If that is the case, the behavior should be the same on both front O2 sensors. keep in mind the rears are after the cats so they should show right about the middle, maybe .5 to .8 volt range. (assuming you run cats) if both front o2 sensors show this stuck lean, then ithink you got a bad tune because i doubt they both went bad at the same time. if you are lean the rear o2 sensors should show lean as well. [/QUOTE]
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O2 Sensor codes after tune
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