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Home >> Mercedes Benz >> 2003 >> CLK430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1031: O2 Sensor Upstream Of TWC (G3/3) & (G3/4) Exchanged >> Testing Procedure
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Testing Procedure

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2002 Mercedes-Benz SL500, 2002 Mercedes-Benz S500, 2002 Mercedes-Benz S430, 2002 Mercedes-Benz E55, and 2002 Mercedes-Benz E430. However, it is still accessible from the selected car via links, so may be relevant.

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

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