Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Front HO2 is always more active with action especially if your throttle body is dirty, because throttle actuator has a hard time to follow "PCM" control signals and the first HO2 gets rich and lean situations in a short time. If at this time your engine is idling all over the place I would change air filter if dirty, clean throttle body is a must if you haven't already done so, and inspect your "MAF" sensor for dust,hair, lint or oil. Then clear your code and retest your HO2's. Second HO2 is always calmer because it's after the "CAT".
---------- Post added at 06:44 PM ---------- Previous post was at 06:39 PM ----------
Where do you live to have intake air at 127°F? Might want to look at your intake air temperature sensor. That could explain your lean code. It is coupled with the "MAF"
Never drive faster than your guardian angel can fly
Last edited by Coby7; 05-16-2013 at 02:46 PM.