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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Controls - Self-Diagnostics - 4.0L) >> Diagnostic Tests >> DTC P0134 & P0154: Ho2S Bank 1 & 2 Sensor 1 - Insufficient Activity >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 5

    If the voltage displayed on the scan tool changes from near bias to above 1000 mV, the HO2S bank 1 sensor 1 may be shorted to the HO2S heater low control circuit. This condition will only occur with the key ON, engine OFF or when the engine is running and the bank 1 sensor 1 heater is commanded OFF.
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