"I usually took me 1 week and approx. 200 miles of driving to throw another code after changing an O2 sensor...keep your fingers crossed!!"
Ditto that, I have been chasing a P1275 CEL code that I started getting when I put on 100-cell cats and had the car chipped. I also replaced all 4 oxygen sensors at that time. We have been playing with moving sensors and we even replaced one of the cats that the code reader said was running at a low efficiency. Like clockwork at 120-125 miles after we mess with the system I get the P1275 CEL again.
BTW, we are really stumped by the error code. The car has had the CPU reprogrammed to take into account the intake and exhaust including the high-flow cats. The last time we looked we got the P1275 and it said the left bank was running at low efficiency, which means the cat or the oxygen sensor is acting up. We then swapped oxygen sensors on the left and right side and again got the P1275 saying the left bank was bad.
That made us think it was the cat on that side, which we replaced last week, I just put on 125 miles, and again got the P1275 CEL, any ideas on what might be going on would be greatly appreciated,
Ed
