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2002 MERCEDES-BENZ SL

3.0L I6•RWD•AUTOMATIC•gas
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Repairs0Labor564Torque3477Fluid7DTC698Battery1Maintenance0Recalls0
P1031moderate severityPowertrain

Heated Oxygen Sensor Exchange Banks Swapped

on 2002 Mercedes-Benz SL 3.0L I6 · RWD

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.

Other Powertrain codes on this vehicle

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