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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P0141: Ho2S Heater Performance (Bank 1; Sensor 2) >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 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. 3

    As the heater warms the oxygen sensor to operating temperature, the HO2S will generate an output voltage proportional to the amount of oxygen in the exhaust. With the ignition ON and the engine OFF, the exhaust usually contains a high oxygen content. With the engine off, HO2S voltage will usually decrease from the initial, or bias, voltage due to the high oxygen content.

  2. 5

    This step checks for a correct HO2S heater ignition feed and ground supply.

  3. 6

    This step checks for proper PCM and signal circuit operation.
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