P0031
HO2S Heater Control Circuit Low Bank 1 Sensor 1
1997-2000 BMW 528i E39 2.8L I6 🇬🇧
Low SeverityPowertrain
Description
The voltage in the Bank 1 Sensor 1 O2 heater circuit is lower than expected.
Symptoms
- Check Engine Light
- Extended warmup time
- Poor cold-start emissions
Common Causes
- Short to ground in heater circuit
- Faulty O2 sensor
- Corroded connector
Diagnostic Steps
- Test heater circuit voltage
- Check for shorts to ground
- Test sensor heater resistance
- Inspect connector
Repair Notes
Repair short or replace O2 sensor.
Related Codes
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- P0003Fuel Volume Regulator Control Circuit Low
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- 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
P0031 on Other Vehicles
Common Questions
What does code P0031 mean on a 1997-2000 BMW 528i E39?
P0031 stands for "HO2S Heater Control Circuit Low Bank 1 Sensor 1". The voltage in the Bank 1 Sensor 1 O2 heater circuit is lower than expected.
What are the symptoms of P0031 on a BMW 528i E39?
Common symptoms of P0031 include: Check Engine Light, Extended warmup time, Poor cold-start emissions.
What causes P0031 on a 1997-2000 BMW 528i E39?
Common causes of P0031 include: Short to ground in heater circuit, Faulty O2 sensor, Corroded connector.