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Home >> Chevrolet >> 2001 >> Cavalier LS, 2.2 4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Engine Controls Self-Diagnostics - 2.4L) >> 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 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2

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

  2. 4

    This step checks for proper HO2S heater ignition 1 voltage and ground supply.

  3. 5

    This step checks for proper PCM and signal circuit operation.
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