P0141 · blink 27 – OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION(BANK1 SENSOR2)
- System
- EFI 1NZ-FE/2NZ-FE
- Dashboard light
- Malfunction indicator lamp (Check Engine)
- Check-engine blink code
- 27
- Market note
- HONG KONG ONLY
- Applies to
- 2NZ-FE 1.3 (PK XLi/GLi NZE120) and 1NZ-FE 1.5 (JDM NZE121/NZE124 Corolla/Fielder/Runx)
- Description
- OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION(BANK1 SENSOR2)
- Detection / symptoms
- Detection: 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)
- Possible causes
- Open or short in heater circuit of oxygen sensor; Oxygen sensor heater; Engine ECU
- What to check
- Workshop check order (RM821E): INSPECT ECU -> CHECK OXYGEN SENSOR(OXYGEN SENSOR HEATER) -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−OXYGEN SENSOR) (See -> CHECK ENGINE ECU POWER SOURCE CIRCUIT -> CHECK HARNESS AND CONNECTOR(E.F.I.CONPUTER RELAY−OXYGEN
- Confidence
- high (official Toyota RM821E)
From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights