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Home >> Saturn >> 2002 >> LW200 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0140: Ho2S2 Circuit - Insufficient Activity >> Diagnostic Aids

Diagnostic Aids

To locate an intermittent problem, use scan tool to monitor HO2S2 voltage with engine idling at normal operating temperature. Bias voltage (425-460 millivolts) will appear on scan tool if there is an open anywhere in sensor circuit.

Voltage on each circuit, Purple/White wire and Tan/White wire, with HO2S2 disconnected and ignition ON should read 4-6 volts.

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