catalytic converter 03 Impala?
I have a 2003 Impala 3.4L V6 engine. The check engine light is on and my mechanic told me the code comes for the catalytic converter efficiency. What exactly would be the problem for this part? How much is it to replace?
you have an oxygen sensor before and after the catalytic convertor on that vehicle.... the o2 sensor in front of the cat will switch from rich to lean often and constantly, when the vehicle warms up the o2 sensor behind the cat will even out because the
