My 2003 C4S @166k failed emission test - running rich!
There are no engine faults or OBD2 codes
Running rich at idle - post-sensor mirroring pre-sensor - is this a sign that CATs are not doing their job?
I have plotted the o2 sensors (pre/post cat) reading from both banks. MAF reading and have tried to compare the data.
Can anyone help?
There are no engine faults or OBD2 codes
Running rich at idle - post-sensor mirroring pre-sensor - is this a sign that CATs are not doing their job?
I have plotted the o2 sensors (pre/post cat) reading from both banks. MAF reading and have tried to compare the data.
Can anyone help?