Originally Posted by PA-Outback2000
try an o2 sensor spacer (spark plug spacers would work), which moves the sensor out of the exhaust a bit.
i was CEL free untill i added the borla header to the mix. i was running stromung catback and random technology high-flow cat before the header. once i got those codes, i put the spacer on and have been CEL free for 3-4 years.
Do not use an o2 spacer. read this to find out why:
You can go into the ecu and disable the codes, or simply ignore them. They are cat efficiency codes.