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2013 MERCEDES-BENZ ML
4.6L Turbo V8•AWD•AUTOMATIC•gas•M278•turbo
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Repairs0Labor506Torque712Fluid8DTC1855Battery2Maintenance0Recalls0
P1031moderate severityPowertrain

Heated Oxygen Sensor Exchange Banks Swapped

on 2013 Mercedes-Benz ML 4.6L Turbo V8 · AWD

What this code means

The ECU detected that the upstream heated oxygen sensor connectors for Bank 1 and Bank 2 appear to be swapped. The sensor signals do not correspond to the expected bank, likely due to incorrect wiring after service.

Symptoms

  • Check Engine Light
  • Poor fuel economy
  • Rough running
  • Failed emissions test

Common causes

  • O2 sensor connectors swapped after repair
  • Wiring crossed between banks
  • Incorrect sensor installation during service

Diagnostic steps

  1. Verify which O2 sensor connector goes to which bank
  2. Trace wiring from each sensor to ECU
  3. Induce a rich/lean condition on one bank and verify correct sensor responds
  4. Check sensor connector routing

Repair notes

Swap the O2 sensor connectors back to the correct bank positions.

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