P0141 (blink 27, 3ZZ) on Toyota Corolla E120: OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION(BANK1 SENSOR2)
Short answer: P0141 means “OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION(BANK1 SENSOR2)”. The car’s computer has found a fault in the EFI 3ZZ-FE system and turns on the Malfunction indicator lamp (Check Engine). First check: workshop check order (RM821E): INSPECT ECU -> CHECK OXYGEN SENSOR(OXYGEN SENSOR HEATER) -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−OXYGEN SENSOR) -> CHECK ENGINE ECU POWER SOURCE CIRCUIT -> CHECK HARNESS AND CONNECTOR(E.F.I.MAIN RELAY−OXYGEN SENSOR)(See.
- Code
- P0141 · blink 27
- System
- EFI 3ZZ-FE
- Dashboard light
- Malfunction indicator lamp (Check Engine)
- Applies to
- 3ZZ-FE 1.6 (PK SE Saloon 1.6 2002-05 ZZE121)
- 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
What to check, in order
- Workshop check order (RM821E): INSPECT ECU -> CHECK OXYGEN SENSOR(OXYGEN SENSOR HEATER) -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−OXYGEN SENSOR) -> CHECK ENGINE ECU POWER SOURCE CIRCUIT -> CHECK HARNESS AND CONNECTOR(E.F.I.MAIN RELAY−OXYGEN SENSOR)(See
Related on this car
Same code on other cars
- P0141 · Toyota Passo (1st gen)
- P0141 · Toyota Vitz (1st gen)
- P0141 · Toyota Corolla (11th gen, E170)
- P0141 · Toyota Corolla (10th gen, E140)
- P0141 · Honda City (5th gen, GM2)
- P0141 · Honda Civic (10th gen, FC)
- P0141 · Suzuki Wagon R (Pakistan, K10B)
- P0141 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.