P0135: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
Short answer: P0135 means “O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)”. It is a standard OBD-II code, so the basic meaning is the same on every car. Below is what it means on each of the 8 cars we cover, with a link to the full page for each car.
Standard OBD-II code Same meaning on all cars (SAE J2012).
P0135 on each car
| Car | Meaning on this car | Confidence |
|---|---|---|
| Toyota Passo (1st gen) | Oxygen Sensor Heater Circuit Malfunction (P0135/23) | high |
| Toyota Vitz (1st gen) | Front oxygen sensor heater circuit | medium |
| Toyota Corolla (9th gen, E120) | OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION(BANK1 SENSOR1) (P0135/21) | high |
| Toyota Corolla (11th gen, E170) | O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) | medium |
| Toyota Corolla (10th gen, E140) | O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) | medium |
| Honda City (5th gen, GM2) | O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) | medium |
| Honda Civic (10th gen, FC) | O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) | medium |
| Suzuki Wagon R (Pakistan, K10B) | O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) | medium |
Symptoms
- Check engine light on
Likely causes
- O2 Heater element resistance is high
- Internal short or open in the heater element
- O2 heater circuit wiring high resistance
- Open or short to ground in the wiring harness
What to check, in order
- Read the code and live data with an OBD-II scanner
- Look for exhaust or vacuum leaks and check the wiring of the sensor or valve
- Test the part before replacing it
- Fix the cause, clear the code and test-drive
Causes and checks above are the general meaning. The exact test steps and values differ by car: open your car’s page.