P0135Mini ClubmanYears: 1996 - 2026
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
Reviewed by ASE Certified Technician
What does this mean?
Code P0135 indicates a malfunction in the heater circuit of the upstream O2 sensor on Bank 1. The heater brings the sensor to operating temperature quickly.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Mini Clubman models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Failed O2 sensor heater circuit
Faulty oxygen (O2) sensor
Damaged, chafed, or broken wiring harness
Corroded or loose electrical connector
Symptoms to Watch For
- Check Engine Light is illuminated
- Decreased fuel economy
- Failed emissions test