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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0137, P0138, P013A, P013B, P013E, P013F, P2270, or P2271 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify there are no DTCs set related to the following component/system: B52 Heated Oxygen Sensor
    • Go to next step: If a related DTC is not set 
  3. Engine - Idling - At normal operating temperature.
  4. Verify the scan tool parameter: HO2S 2 = 50 to 1050 mV
    • If not between 50 and 1, 050 mV 

      Refer to: Circuit/System Testing

    • Go to next step: If between 50 and 1, 050 mV 
  5. Verify the scan tool parameter: HO2S 2 = The value should not spike or drop out.

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: B52 Heated Oxygen Sensor
    • Wiggle the harness and connector: K20 Engine Control Module
    • If the value spikes or drops out 

      Repair as necessary - Wiring/Terminal(s)/Electrical Connector(s)

    • Go to next step: If the value does not spike or drop out 
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  7. All OK.
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