2008 H3 Alpha, 5.3L, 170,000km

A few weeks ago I had a P01B code come up (slow response h0s2 sensor lean to rich, sensor 2). I cleared it and it came back a few days later, it hen it cleared itself but reappeared a few days later.

so I replaced the post cat sensor on the drivers side (bank 1 sensor 2) with a brand new Bosch sensor. I cleared the code.

now, p013A came up about a week later—same thing but it says rich to lean slow response (instead of lean to rich).

anyone have any ideas?

just to confirm, Bank 1 is the driver side right? I’m pretty sure. If it’s not the o2 sensor what could it be?

Truck performs normally and gas mileage seems to be the same as always.

 

Have you checked your air filter, I was getting the same code, cleaned my filter and have not had it come back, also from what I read that code can be caused by a lot of things.

 

Bank 1 is the engine bank with cylinder 1 in it. That is front on driver side.

The same codes can be cause by a poor connection to the O2 sensor, like frayed wiring, dirty connector, cracked or pinched wire, etc. It amounts to an improper voltage read of the O2 sensor by the PCM, can be a bad O2, or bad wiring.

 

Apparently there is a TSB out there for P013 codes...requires an ECM reprogram with "the latest update."

Had that done this morning at the dealer, CEL is off. Will let you guys know if it comes back on.

 

Found a GM TSB online for these codes, which reccomenced a reflash of the ECM with the latest update.

Took it to my local dealer and they did the reprogram of ECM and then a crankshaft re-learn. Has been 5 days and so far no code has re-appeared, so I'm thinking this did it.