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Mercedes Benz
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2001
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ML320
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Self-Diagnostics
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Diagnostic Tests
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DTC P1031: O2 Sensor Upstream TWC (G3/3) & (G3/4) Transposed
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Testing Procedure
Testing Procedure
Verify upstream O2 sensor connectors are properly connected. Repair as necessary.