P0430 Buick

Question

I have a 2009 Buick Enclave CXL, the code P0430 was set, the Catalitic Converter and the up and Down stream O2 sensors were replace, have brand new sprak plugs, the code was turn off but it just came back again. The car do not have any driving or starting issues, just the check engine light on. Any ideas of possible the solutions to this problem? Thanks a lot.

Answer 1

what type of fuel are you using? I would use 91 octane from Shell along with a good fuel system cleaner and maybe do an intake flush.

also you might have to clear the ECM after you replace the sensor. I would disconnect the battery for an hour or so to make sure it has been cleared. clearing the OBD-II code is not the same and not many OBD-II reader can do this.