RAALMEIDA2004
Newbie
Im getting a P0421 cel. It suggests replace to cat. which one? preconverter or catalytic converter?
How do i test for a clogged converter. do i test exhaust back pressure after the preconverter and after the catalytic converter?
Which o2 sensor would be setting off this p0421 code?
Any help would be greatly appreciated...
Thanks a million guys......
How do i test for a clogged converter. do i test exhaust back pressure after the preconverter and after the catalytic converter?
Which o2 sensor would be setting off this p0421 code?
Any help would be greatly appreciated...
Thanks a million guys......
