Hi All-
Having some trouble with P0420 and P0430 codes (2012 CX9, 140k miles). This past summer car had P0420, took it to local mechanic who replaced the Bank 1 Upstream O2 sensor...did not solve the problem. I then bought a new set of cats and brought them to him, he replaced Bank 1 Cat and the downstream O2 sensor, then handed me back the Bank 2 cat and said hold off on replacing that one. This did not work, CEL still on, so I waited until this past week when I had access to a lift and I replaced the Bank 2 Cat and both O2 sensors (estimate I drove 8k miles in between replacing Bank 1 Cat an Bank 2 Cat). But the CEL is still coming on after driving for approx 20-30 miles...both P0420 and P0430.
So now both cats are new as are all 4 O2 Sensors. Plugs, Coil Packs, and all fuel injectors were replaced at 100k. No noticeable exhaust leaks, and no driveabilty issues...car idles perfectly, and runs very well.
Is there some type of drive cycle sequence to be performed after completing all of the above work in order to clear the codes? Or am I missing something else that can be triggering these codes?
Thanks!
Brian
Having some trouble with P0420 and P0430 codes (2012 CX9, 140k miles). This past summer car had P0420, took it to local mechanic who replaced the Bank 1 Upstream O2 sensor...did not solve the problem. I then bought a new set of cats and brought them to him, he replaced Bank 1 Cat and the downstream O2 sensor, then handed me back the Bank 2 cat and said hold off on replacing that one. This did not work, CEL still on, so I waited until this past week when I had access to a lift and I replaced the Bank 2 Cat and both O2 sensors (estimate I drove 8k miles in between replacing Bank 1 Cat an Bank 2 Cat). But the CEL is still coming on after driving for approx 20-30 miles...both P0420 and P0430.
So now both cats are new as are all 4 O2 Sensors. Plugs, Coil Packs, and all fuel injectors were replaced at 100k. No noticeable exhaust leaks, and no driveabilty issues...car idles perfectly, and runs very well.
Is there some type of drive cycle sequence to be performed after completing all of the above work in order to clear the codes? Or am I missing something else that can be triggering these codes?
Thanks!
Brian