Oxygen sensor; Fuel trim malfunction

P0136 (blink 27, 3ZZ) on Toyota Corolla E120: OXYGEN SENSOR CIRCUIT MALFUNCTION(BANK1 SENSOR2)

Short answer: P0136 means “OXYGEN SENSOR 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): READ OUTPUT DTC CODES -> READ VALUE OF O2S B1,S1 -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−OXYGEN SENSOR) -> CHECK WHETHER MISFIRE IS OCCURRED OR NOT BY MONITORING DTC AND -> CHECK EMISSION CONTROL SYSTEM -> CHECK FUEL PRESSURE -> CHECK FUEL INJECTOR ASSY -> CHECK GAS LEAKAGE ON EXHAUST SYSTEM -> PERFORM CONFIRMATION DRIVING PATTERN.

Code: P0136 · 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

Condition (a) and (b) continues for 60 secs. or more: (c) Voltage output of oxygen sensor remains at 0.35 V or more, or 0.55 V or less, during idling after engine is warmed up (d) Oxygen sensor output voltage amplitude is less than 0.3 V.

Likely causes

Oxygen sensor; Fuel trim malfunction

What to check, in order

Workshop check order (RM821E): READ OUTPUT DTC CODES -> READ VALUE OF O2S B1,S1 -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−OXYGEN SENSOR) -> CHECK WHETHER MISFIRE IS OCCURRED OR NOT BY MONITORING DTC AND -> CHECK EMISSION CONTROL SYSTEM -> CHECK FUEL PRESSURE -> CHECK FUEL INJECTOR ASSY -> CHECK GAS LEAKAGE ON EXHAUST SYSTEM -> PERFORM CONFIRMATION DRIVING PATTERN

Related on this car

Same code on other cars

← P0130/21 P0141/27 →

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.