P0135 (blink 21) on Toyota Corolla E120: OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION(BANK1 SENSOR1)
Short answer: P0135 means “OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION(BANK1 SENSOR1)”. The car’s computer has found a fault in the EFI 1NZ-FE/2NZ-FE system and turns on the Malfunction indicator lamp (Check Engine). First check: open or short in heater circuit of oxygen sensor; Oxygen sensor heater; Engine ECU.
- Code
- P0135 · blink 21
- System
- EFI 1NZ-FE/2NZ-FE
- Dashboard light
- Malfunction indicator lamp (Check Engine)
- Applies to
- 2NZ-FE 1.3 (PK XLi/GLi NZE120) and 1NZ-FE 1.5 (JDM NZE121/NZE124 Corolla/Fielder/Runx)
- Market note
- UNLEADED GASOLINE ONLY
- Confidence
- high (official Toyota RM821E)
- Source
- toyotamanuals.gitlab.io
Symptoms and when it is set
- S When the heater operates, heater current exceeds 2 A (2 trip detection logic) S Heater current of 0.2 A or less when the heater operates (2 trip detection logic)
Likely causes
- Open or short in heater circuit of oxygen sensor; Oxygen sensor heater; Engine ECU
Related on this car
- Upstream O2 sensor ageing
- All fault codes for this car
- Warning lights
- Where the parts are (parts map)
- Common problems
Same code on other cars
- P0135 · Toyota Passo (1st gen)
- P0135 · Toyota Vitz (1st gen)
- P0135 · Toyota Corolla (11th gen, E170)
- P0135 · Toyota Corolla (10th gen, E140)
- P0135 · Honda City (5th gen, GM2)
- P0135 · Honda Civic (10th gen, FC)
- P0135 · Suzuki Wagon R (Pakistan, K10B)
- P0135 on all cars compared
Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.