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2000 BMW 528I
2.8L I6 M52•RWD•AUTOMATIC•gas•M52B28
1 active safety recall on this vehicle — view recalls
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Repairs0Labor495Torque3158Fluid8DTC1997Battery1Maintenance0Recalls1
P0419low severityPowertrain

Secondary Air Injection System Relay B Circuit Malfunction

on 2000 BMW 528i 2.8L I6 M52 · RWD

What this code means

The PCM detected a fault in the secondary air injection pump relay B circuit. This relay controls power for the air pump during warm-up.

Symptoms

  • Check engine light on
  • Air pump inoperative
  • Failed emissions test

Common causes

  • Faulty relay B
  • Open or shorted wiring
  • Blown fuse
  • Faulty PCM driver

Diagnostic steps

  1. Scan and confirm P0419
  2. Test relay B operation
  3. Inspect wiring and fuse
  4. Check PCM control output
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