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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 108 (Engine Controls Self-Diagnostics - 5.7L Corvette) >> Diagnostic Tests >> DTC P1133 & P1153: Ho2S Circuit - Insufficient Switching - Bank 1 & 2, Sensor 1 >> Test Description

Test Description

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The numbers below refer to the step numbers in the diagnostic procedures.

  1. 2

    This step determines if the condition is present. This test may take 5 minutes for the diagnostic to run.

  2. 3

    When DTCs P1133 and P1153 are set at the same time, fuel contamination is likely.

  3. 4

    An exhaust leak 6-12" (152-304 mm) from the HO2S can cause a DTC to set.

  4. 5

    This step verifies whether a good ground circuit is available.

  5. 6

    This step verifies the integrity of the signal circuit to the PCM.

  6. 7

    This step verifies the integrity of the signal circuit to the PCM.

  7. 8

    Certain Room-Temperature Vulcanizing (RTV) silicone gasket materials release vapors that can contaminate the HO2S. Silicone in the fuel can also cause silicone contamination. If the sensors appear to be contaminated by silicone, and if the silicone sealant has a non-silicone base, advise the customer to try a different fuel company.

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