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My check engine light won't stay off more than a couple days, and keeps sending the code that the O2 sensor is problematic. Its been reset 3 times and keeps coming back on. My mechanic tested the O2 sensor (I think it was the front) and it tested fine, so he saw no need to replace it. Gas mileage has been as good as always. So I'm running around with the check engine light unless my gas mileage, power, or driveability show problems. Anyone got a clue to what the problem might be? This started about the time I had a both a leak in the crank case (which was fixed and cleaned up) and the starter went and was replaced. I've had a CAI for about 3 years and never had a problem with the o2 sensor, and its is at least 50k miles old, and probably original at 108k. Thanks.
 

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even better the 2nd time
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are you sure its the O2 sensor before the cat, and not after?
thatd be something id check in to

if it is the front one, its like $60 at AutoZone
id buy one, try it out

if it doesnt work, take it back and get your money back

nothing to lose but time really...and its super easy to change
 
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