Fuel trim spread is greater than 10 points, bank 2

Well, I'm happy to report that after changing the O2 sensors, I am showing no codes or pending codes after 2 normal days of driving. Before I was getting to work and about half way back before throwing the P0430 code.

The STFT on both banks is between -0.7 and 3.0, staying most of the time at 1.5; and LTFT is about the same (-1.5 to 3.5).

Will post here again if I throw any more cat codes.

Thanks again, everyone!

 

Sorry for the late response.

Yeah, I replaced both post-cat O2 sensors. Apparently they were just getting old and failing intermittently. Not a constant low voltage read, but enough to trick the ECM into thinking the cats were bad.

The passenger side was not that difficult to do. Just stuck a flathead screwdriver in-between the sensor wires and the clip that holds the sensor wires to the wiring harness and pulled them apart. The driver's side, on the other hand, was a pain. The sensor and the wiring harness straddle the drive shaft going to the front differential, since I have 4wd. I thought I was going to have to disconnect the driveshaft in order to get to the plug. Ended up squeezing the harness with one set of pliers on one side of the driveshaft, and pulling the sensor wires off with another set of pliers on the outside edge of the driveshaft.

Then, I just had to keep an eye rinsing station ready while trying to unscrew the sensor from the exhaust pipe, as pieces of dirt that had accumulated over the past 8 years fell into my eyes, nose, and teeth.

Still running with no codes.