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1997 BMW 528I
2.8L I6 M52•RWD•AUTOMATIC•gas
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Repairs0Labor511Torque3236Fluid8DTC642Battery1Maintenance0Recalls0
P1084moderate severityPowertrain

Fuel Control Mixture Rich Bank 1

on 1997 BMW 528i 2.8L I6 M52 · RWD

What this code means

The DME detected a rich fuel mixture condition on Bank 1 that exceeds the long-term fuel trim correction range. The engine is receiving too much fuel or insufficient air, and the adaptive system can no longer compensate.

Symptoms

  • Check Engine Light
  • Black exhaust smoke
  • Fuel smell from exhaust
  • Rough idle
  • Poor fuel economy

Common causes

  • Leaking fuel injectors Bank 1
  • Faulty O2 sensor Bank 1 reporting false lean
  • High fuel pressure
  • EVAP purge valve stuck open
  • Crankcase ventilation valve (CCV) failure

Diagnostic steps

  1. Monitor fuel trim values on Bank 1
  2. Test O2 sensor response Bank 1
  3. Check fuel pressure regulator
  4. Inspect EVAP purge valve operation
  5. Test CCV valve for proper sealing

Repair notes

Replace faulty O2 sensor or repair fuel delivery issue causing rich condition.

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