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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 52 (Engine Control System (A25A-FXS) - Diagnostic Codes (P0128-P0171)) >> SFI System >> DTC P0136-16: A/F (O2) Sensor Circuit Bank 1 Sensor 2 Circuit Current (Voltage) Below Threshold; DTC P013A-7C: A/F Sensor - Rich to Lean Bank 1 Sensor 2 Slow Response [10/2022 - 11/2023] >> Procedure

DTC P0136-16: A/F (O2) Sensor Circuit Bank 1 Sensor 2 Circuit Current (Voltage) Below Threshold; DTC P013A-7C: A/F Sensor - Rich to Lean Bank 1 Sensor 2 Slow Response [10/2022 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. READ OUTPUT DTC (IN ADDITION TO DTC P0136-16 AND P013A-7C) 
    1. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P0136-16 is output A
      DTC P013A-7C is output B
      DTC P0136-16 or P013A-7C and other DTCs are output C

      HINT: 

      If any DTCs other than P0136-16 or P013A-7C are output, troubleshoot those DTCs first.

    Result: 

    B 

    See step  14

    Result: 

    C 

    GO TO DTC CHART  . Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 11/2023]

    Result: 

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR) 
    1. Put the engine in Inspection Mode (Maintenance Mode).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    2. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
    3. Idle the engine for 5 minutes or more with the shift lever in P.
    4. Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.

      Powertrain > Engine > Active Test 

      Active Test Display
      Control the Injection Volume for A/F Sensor
      Data List Display
      A/F (O2) Sensor Current B1S1
      A/F (O2) Sensor Current B1S2
    5. Monitor the output values of the air fuel ratio sensor (sensor 1) and air fuel ratio sensor (sensor 2) (A/F (O2) Sensor Current B1S1 and A/F (O2) Sensor Current B1S2) displayed on the GTS.

      HINT: 

      • The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.
      • The air fuel ratio sensor (sensor 1) has an output delay of a few seconds and the air fuel ratio sensor (sensor 2) has a maximum output delay of approximately 20 seconds.
      • If the sensor output value does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.
      STANDARD

      GTS Display (Sensor) Injection Volume Status Current
      A/F (O2) Sensor Current B1S1
      (Air fuel ratio (sensor 1))      		 12.5% Rich Below -0.075 mA
      -12.5% Lean More than 0.037 mA
      A/F (O2) Sensor Current B1S2
      (Air fuel ratio (sensor 2))      		 12.5% Rich Below -0.86 mA
      -12.5% Lean More than 0.33 mA

      Result

      Status of A/F (O2) Sensor Current B1S1 Status of A/F (O2) Sensor Current B1S2 Suspected Trouble Area Proceed to
      Lean/Rich Lean/Rich
      • Air fuel ratio sensor (sensor 2)
      		 A
      Lean Lean
      • Gas leak from exhaust system
      • EGR valve assembly
      • Extremely lean actual air fuel ratio
      • Air fuel ratio sensor (sensor 2)
      		 B
      Rich Rich
      • Gas leak from exhaust system
      • EGR valve assembly
      • Extremely rich actual air fuel ratio
      • Air fuel ratio sensor (sensor 2)
      Lean/Rich Lean
      • Air fuel ratio sensor (sensor 2)
      • Gas leak from exhaust system
      		 C
      Lean/Rich Rich
      • Air fuel ratio sensor (sensor 2)
      • Gas leak from exhaust system
      Lean Lean/Rich
      • Air fuel ratio sensor (sensor 1)
      • Air fuel ratio sensor (sensor 2)
      		 D
      Rich Lean/Rich
      • Air fuel ratio sensor (sensor 1)
      • Air fuel ratio sensor (sensor 2)
      1. Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output current (A/F (O2) Sensor Current B1S1) is consistently more than 0.037 mA, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently more than 0.33 mA.
      2. Rich: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output current (A/F (O2) Sensor Current B1S1) is consistently below -0.075 mA, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently below -0.86 mA.
      3. Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output current of the air fuel ratio sensor (sensor 1) or air fuel ratio sensor (sensor 2) alternate correctly.

      HINT: 

      Refer to "Data List / Active Test" [A/F (O2) Sensor Current B1S1, A/F (O2) Sensor Current B1S2].

      Refer to DATA LIST / ACTIVE TEST [10/2022 - 11/2023]

    Result: 

    B 

    See step  6

    Result: 

    C 

    See step  10

    Result: 

    D 

    See step  11

    Result: 

    A 

    See step  3

  3. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) 

    Refer to REMOVAL [12/2019 - ]

    HINT: 

    Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

    Refer to INITIALIZATION [10/2021 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  4

  4. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    2. Turn the ignition switch off and wait for at least 30 seconds.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 
    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    2. Check the DTC judgment result.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
      RESULT

      GTS Display Description
      NORMAL
      • DTC judgment completed
      • System normal
      ABNORMAL
      • DTC judgment completed
      • System abnormal
      INCOMPLETE
      • DTC judgment not completed
      • Perform driving pattern after confirming DTC enabling conditions
    3. Input the DTC: P0136-16.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

  6. CHECK FOR EXHAUST GAS LEAK 
    1. Check for exhaust gas leaks.

      OK

      No gas leaks in exhaust system.

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the exhaust system.

      Refer to INITIALIZATION [10/2021 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE EXHAUST SYSTEM 

    Result: 

    OK 

    See step  7

  7. PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION) 
    1. Put the engine in Inspection Mode (Maintenance Mode).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    2. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature

      HINT: 

      The A/C switch and all accessories should be off.

    3. Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

      Powertrain > Engine > Active Test 

      Active Test Display
      Control the EGR Step Position
      Data List Display
      Intake Manifold Absolute Pressure
      Engine Independent
      NOTE:
      • Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.
      • Be sure to return the EGR valve to step 0 when the Active Test is completed.
      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK

      The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

      Standard

      - Control the EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps
      Intake Manifold Absolute Pressure
      (Data List)      		 (EGR valve is fully closed) Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed

      HINT: 

      • If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
      • While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
      • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  9

    Result: 

    NG 

    See step  8

  8. INSPECT EGR VALVE ASSEMBLY 
    1. Remove the EGR valve assembly.

      Refer to REMOVAL [10/2022 - 11/2023]

    2. Check if the EGR valve is stuck open.

      OK

      EGR valve is tightly closed.

      HINT: 

      Perform "Inspection After Repair" after replacing the EGR valve assembly.

      Refer to INITIALIZATION [10/2021 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE EGR VALVE ASSEMBLY 

    Refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    OK 

    See step  9

  9. CHECK CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO 
    1. Check the cause of extremely rich or lean actual air fuel ratio, referring to the DTC P0171-00 and P0172-00 Inspection Procedure.

      Refer to DTC P0171-00: System Too Lean Bank 1; DTC P0172-00: System Too Rich Bank 1; DTC P1170-00: Fuel Performance/Port Injector; DTC P117B-00: Fuel Performance/Direct Injector [10/2022 - 11/2023]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  12

  10. CHECK FOR EXHAUST GAS LEAK 
    1. Check for exhaust gas leaks.

      OK

      No gas leaks in exhaust system.

      HINT: 

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) 

    Refer to REMOVAL [12/2019 - ]

    Result: 

    NG 

    REPAIR OR REPLACE EXHAUST SYSTEM 

  11. REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) 

    Refer to REMOVAL [12/2019 - ]

    HINT: 

    Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).

    Refer to INITIALIZATION [10/2021 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  12

  12. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    2. Turn the ignition switch off and wait for at least 30 seconds.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  13

  13. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136-16) 
    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    2. Check that the DTC judgment result is NORMAL. If the DTC judgment result is INCOMPLETE, perform the confirmation drive pattern again but increase the vehicle speed.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    3. Input the DTC: P0136-16.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P0136-16 is output)      		 B

      HINT: 

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

      Refer to INITIALIZATION [10/2021 - ]

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) 

    Refer to REMOVAL [12/2019 - ]

  14. CHECK FOR EXHAUST GAS LEAK 
    1. Check for exhaust gas leaks.

      OK

      No gas leaks in exhaust system.

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the exhaust system.

      Refer to INITIALIZATION [10/2021 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE EXHAUST SYSTEM 

    Result: 

    OK 

    See step  15

  15. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    2. Turn the ignition switch off and wait for at least 30 seconds.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  16

  16. CHECK WHETHER DTC OUTPUT RECURS (DTC P013A-7C) 
    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    2. Check that the DTC judgment result is NORMAL. If the DTC judgment result is INCOMPLETE, perform the confirmation drive pattern again but increase the vehicle speed.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    3. Input the DTC: P013A-7C.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P013A-7C is output)      		 B

      HINT: 

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

      Refer to INITIALIZATION [10/2021 - ]

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2019 - ]

    Result: 

    B 

    REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) 

    Refer to REMOVAL [12/2019 - ]

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