HO2S Heater Current Monitor Control Circuit Bank 1
2002-2007 Buick Rendezvous 3.5L V6
Description
The PCM detected a fault in the heated oxygen sensor heater current monitor control circuit for Bank 1 Sensor 1. The heater is used to bring the O2 sensor up to operating temperature quickly.
Symptoms
- Check Engine Light
- Poor cold-start fuel economy
- Extended warmup emissions
- Failed emissions test
Common Causes
- Faulty O2 sensor heater element
- Blown heater circuit fuse
- Corroded wiring or connector
- PCM heater driver failure
Diagnostic Steps
- Check O2 sensor heater fuse
- Test heater circuit resistance
- Inspect wiring and connectors
- Test PCM heater output
Repair Notes
Replace O2 sensor if heater resistance is out of spec. Check fuse and wiring first.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1031 on Other Vehicles
Common Questions
What does code P1031 mean on a 2002-2007 Buick Rendezvous?
P1031 stands for "HO2S Heater Current Monitor Control Circuit Bank 1". The PCM detected a fault in the heated oxygen sensor heater current monitor control circuit for Bank 1 Sensor 1. The heater is used to bring the O2 sensor up to operating temperature quickly.
What are the symptoms of P1031 on a Buick Rendezvous?
Common symptoms of P1031 include: Check Engine Light, Poor cold-start fuel economy, Extended warmup emissions, Failed emissions test.
What causes P1031 on a 2002-2007 Buick Rendezvous?
Common causes of P1031 include: Faulty O2 sensor heater element, Blown heater circuit fuse, Corroded wiring or connector, PCM heater driver failure.