P0135Severity: Medium
P0135 – Oxygen Sensor Heater Circuit (Bank 1 Sensor 1)
A fault in the upstream O2 sensor's heater circuit.
What it means
The heater circuit that brings the oxygen sensor up to temperature quickly is faulty. The sensor cannot reach operating temperature.
Symptoms
- Check-engine light
- High emissions when cold
- Increased fuel use
Common causes
- Faulty sensor heater
- Blown fuse
- Wiring/connector issue
- Relay failure
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Frequently asked questions
What does trouble code P0135 mean?
P0135 – Oxygen Sensor Heater Circuit (Bank 1 Sensor 1). The heater circuit that brings the oxygen sensor up to temperature quickly is faulty. The sensor cannot reach operating temperature.
Can I drive with a P0135 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.