[slodave]

Originally Posted by NICKG

ahem..a word from someone who sells cats for a living...your corolla has a program flash at the dealer to "eliminate" the rear o2 senser..and fix persistent
p0420 codes

second the role of the pre cat o2 senser is the same as it always was..it is the mixture regulation control...the after cat sensers are "nanny" devices that ONLY moniter catalyst efficency...they play no role in mixture unless you have a VERY late model car(even then it is really only long term fuel trim)

Do I just go to the dealer and asked them to flash the computer? Fill me in... Thanks! I have to smog the car in January. A mechanic friend did notice that the Corolla is running a little rich...