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goodwrench9124, ASE Certified Technician
Category: Chevy
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Experience:  Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
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P0141- O2 sensor heater circuit malfunction (bank 1 sensor 2) mean

Resolved Question:

what does P0141- O2 sensor heater circuit malfunction (bank 1 sensor 2) mean. What should i be checking to repair this fault.
Submitted: 9 years ago.
Category: Chevy
Expert:  goodwrench9124 replied 9 years ago.

Hello, and welcome to JA!!!! the code PO141 indicates a problem with the heater circuit of the 02 sensor behind the converter!!!!! the o2 sensor itself may be at fault, but you will need to make some checks first!!!! pretty simple checks!!! first off make sure the fuse is ok for the 02 sensor!!!!!! it is fuse 02 htr fuse it is a 10 amp red fuse. if it is ok, then take a look at some of the things i have included.

An intermittent could be the result of the following conditions:

A poor electrical connection
Moisture in the connector/wiring
Rubbed-through wire insulation
A broken wire inside the insulation

Check for a poor electrical connection or a damaged harness. Inspect the harness electrical connectors for the following conditions:

Improper mating
Broken locks
Improperly-formed electrical connectors
Damaged terminals
A poor terminal-to-wire connection
A damaged harness

Replace the entire HO2S 2 assembly. Do not attempt to repair the HO2S 2 if the following conditions exist:

Damaged wiring
Damaged electrical connectors
Damaged terminals

Obstruction of the air reference and degraded HO2S 2 performance could result from any attempt to repair the above conditions.

The HO2S 2 must have a clean air reference in order for the HO2S 2 to function properly. This clean air reference is obtained by way of the HO2S 2 wires.

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