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2002
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ML320
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Repair and Diagnosis (Single Page)
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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
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Testing Procedure
Verify upstream O2 sensor connectors are properly connected. Repair as necessary.