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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

Testing Procedure

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

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