I have a

p0171 System too Lean (Bank 1)

My cat has been gutted for a quite a few months now and I just I put a MIL eliminator on the 2nd 02 sensor. The CEL came on about a day and a half later. Could this have anything to do with my sensor? The fella at autozone told me to take it out and clean it... but I figured I'd ask here first heh....

brad

sensor needs to be replaced


and also the mil eliminators only prevents pre cat codes, ie P0420 and P0430 ...

Also check for vacuum leaks at gaskets, hoses and hose clampes.

And clean the MAF sensor
http://www.contour.org/mods/mods.php?s=howto&displayid=36
and
http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=zetecmaint&Number=989728&page=&view=&sb=5&o=&fpart=1&vc=1
and
http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/1b/cb/25/0900823d801bcb25.jsp