P0135 — O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
Reviewed1 source
1 source
- Official data (NHTSA)official_feed
What P0135 means
Safe to drive short-term
The front oxygen sensor's heater element fails to reach its operating resistance — the sensor element itself may still be fine.
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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- Faulty sensor heater element
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