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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0141: Ho2S Heater Circuit - Bank 2, Sensor 1 (Jimmy CANADIAN, SONOMA & S10 Pickup) >> Test Description

Test Description

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

  1. 2

    After the ignition is turned ON, the HO2S heater heats up causing the HO2S signal voltage to either increase or decrease. This indicates that the HO2S heater is okay.

  2. 9

    Resistance within the specified range indicates the HO2S heater is okay.
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