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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Engine Controls - 3.9L - DTC P0011 To P0420) >> DTC P0137, P0138 or P0140 >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
DTC P0137, P0138 or P0140

Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance
HO2S High Signal P0137, P0140, P2A01 P0137, P0140, P2A01 P0137, P0140, P2A01 P0138, P0140, P2A01 P0140, P2A01
HO2S Low Signal P2A01 P0137, P0138, P0140, P2A01 P0137, P0138, P0140, P2A01 P0138, P0140, P2A01 P2A01
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