P1135 – O2 Sensor Heater Circuit Malfunction
Want to confirm the real cause of this fault code?
A high‑quality OBD2 scanner gives you live data, fuel trims, sensor readings and freeze‑frame information — exactly what you need to verify the root cause of this code with confidence.
Symptoms
- Rough idle
- Hesitation
- Poor acceleration
- High fuel trims
- Check engine light
Causes
- Faulty heater circuit
- Blown fuse
- Wiring issue
- Connector problem
- ECU issue
Diagnosis
- Inspect O2 wiring
- Check heater fuse
- Test sensor resistance
- Inspect connectors
- Scan live data
Repair
- Replace O2 sensor
- Replace fuse
- Repair wiring
- Fix connectors
- Update ECU