08 bentley azure p0133

Question

p0133
replaced o2 sensor, light still come back on. Any other ideas?
checked/test wiring to/from o2 sensor to pcm.ok
fuel pressure test ok.
no intake or exhaust leak found.
MAF voltage bank 1 seems a bit lower than bank 2. already swap good maf for testing. still no change.

NOW WHAT???

Answer 1

P0133 02 sensor slow response (Bank 1 Sensor 1)

MAF is a slow repsonse? is the 02 location and that sensor correct? The heater circuit is fuse protected so the fuse has to be checked. Disconnect the 02 sensor of Bank 1 Sensor 1, see what code you get. you should have circuit high code for Bank 1 Sensor 1 it easy on this particular engine to mix it connection and 02 sensors.