P0135
O2 Sensor Heater Circuit Bank 1 Sensor 1
2006-2011 BMW 325i 3.0L I6 N52 🇨🇦
Low SeverityPowertrain
Description
The PCM detected a malfunction in the heater element of the upstream O2 sensor on Bank 1.
Symptoms
- Check Engine Light
- Extended warmup emissions
- Failed emissions test
Common Causes
- Faulty O2 sensor heater element
- Blown fuse
- Wiring damage
- PCM heater driver failure
Diagnostic Steps
- Check O2 heater fuse
- Test heater resistance (typically 2-30 ohms)
- Inspect wiring
- Check PCM heater relay output
Repair Notes
Replace O2 sensor if heater resistance is open or out of spec.
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
P0135 on Other Vehicles
Common Questions
What does code P0135 mean on a 2006-2011 BMW 325i?
P0135 stands for "O2 Sensor Heater Circuit Bank 1 Sensor 1". The PCM detected a malfunction in the heater element of the upstream O2 sensor on Bank 1.
What are the symptoms of P0135 on a BMW 325i?
Common symptoms of P0135 include: Check Engine Light, Extended warmup emissions, Failed emissions test.
What causes P0135 on a 2006-2011 BMW 325i?
Common causes of P0135 include: Faulty O2 sensor heater element, Blown fuse, Wiring damage, PCM heater driver failure.