View Full Version : P0158, P0174, P1153 Consistently...

2000 TAWS6
04-03-2012, 08:39 AM
I replaced the 2 rear O2's and still get the same codes.

P0158 says rich (rarely goes under 800mV), P0174 says lean, P1153 says not switching frequently enough.

Only bank 2, and brand new O2 did not help. Cats are only a few months old, GM replaced both under warranty.

Could this be a bad PCM? No idea what to do next. Replaced intake manifold gaskets, replaced PCV system.

Help would be appreciated.