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2002 BMW M5
4.9L V8 S62•RWD•MANUAL•gas•S62B50
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor494Torque2385Fluid8DTC1267Battery1Maintenance0Recalls2
P0431moderate severityPowertrain

Warm Up Catalyst Efficiency Below Threshold Bank 2

on 2002 BMW M5 4.9L V8 S62 · RWD

What this code means

Bank 2 warm-up catalyst efficiency is below threshold.

Symptoms

  • Check Engine Light
  • Failed emissions

Common causes

  • Worn catalyst
  • Rich running during warmup
  • O2 sensor issue

Diagnostic steps

  1. Monitor catalyst
  2. Compare O2 signals
  3. Check exhaust

Repair notes

Replace warm-up catalyst if confirmed.

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