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2000 BMW 525IT E39
2.5L I6 M54 Touring•RWD•AUTOMATIC•gas
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Repairs0Labor547Torque2340Fluid7DTC683Battery1Maintenance0Recalls0
P1416moderate severityPowertrain

Secondary Air System Bank 2

on 2000 BMW 525iT E39 2.5L I6 M54 Touring · RWD

What this code means

The DME detected a malfunction in the secondary air injection system for Bank 2. The system is not delivering sufficient airflow to the exhaust manifold on Bank 2 during cold start conditions.

Symptoms

  • Check Engine Light
  • Failed emissions test
  • Rough cold start idle
  • Air pump noise abnormal

Common causes

  • Faulty secondary air valve Bank 2
  • Carbon blockage in exhaust port Bank 2
  • Secondary air pump failing
  • Vacuum hose leak to air valve
  • Relay or wiring issue

Diagnostic steps

  1. Test secondary air valve operation Bank 2
  2. Inspect exhaust ports for carbon buildup
  3. Test air pump flow output
  4. Check vacuum supply to air valve
  5. Inspect relay and wiring

Repair notes

Clean carbon from exhaust ports or replace secondary air valve on Bank 2.

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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