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Home >> Mercedes Benz >> 2002 >> ML320 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1031: O2 Sensor Upstream TWC (G3/3) & (G3/4) Transposed >> Testing Procedure

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Testing Procedure

Verify upstream O2 sensor connectors are properly connected. Repair as necessary.

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