O2 sensors

Asked by Mar 28, 2019 at 09:57 AM about the 2012 GMC Sierra 3500HD SLE 4WD Chassis

Question type: Maintenance & Repair

Check engine light came on and the codes were for
the O2 sensors, so I replaced all 4 O2 sensors and
is still throwing multiple codes for the 02 bank 2
sensors, any ideas as to why?

4 Answers

5,710

What is engine size? Can you post the code number? Was the only codes, bank 2 sensor 2? Check sensor wiring circuits, check sensor heater circuit where applicable. You may need to check the cat? Also, check fuel trims to see if running rich or lean? Just my opinion.

Has a 6 liter in it and the codes are P0138, P0140, P0158, P02271, P02275, P0160

The codes are bank 1 sensor 2, bank 1 sensor 2, bank 2 sensor 2, bank 1 sensor 2, bank 2 sensor 2, and bank 2 sensor 2!

990

These are codes the downsteam o2 sensors.. high voltage on the signal wires which means either a short to power on both sides or you bought sensors that are wired wrong and the heater circuit is going in the signal circuit.. p02271 and p02275 are reading rich bc of the 12v going into the signal wires

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