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1998 BMW 528I
2.8L I6 M52•RWD•AUTOMATIC•gas
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Repairs0Labor497Torque3173Fluid8DTC1210Battery1Maintenance0Recalls0
P1086moderate severityPowertrain

Fuel Control Mixture Rich Bank 2

on 1998 BMW 528i 2.8L I6 M52 · RWD

What this code means

The DME detected a rich fuel mixture condition on Bank 2 that is beyond the adaptive fuel trim correction range. Fuel trims have reached their maximum negative adjustment limit.

Symptoms

  • Check Engine Light
  • Black smoke from exhaust
  • Strong fuel odor
  • Rough idle
  • Reduced power

Common causes

  • Leaking fuel injectors Bank 2
  • Faulty O2 sensor Bank 2
  • Fuel pressure too high
  • EVAP system fault
  • Crankcase vent valve stuck open

Diagnostic steps

  1. Monitor Bank 2 fuel trims
  2. Test O2 sensor Bank 2 response time
  3. Check fuel pressure with gauge
  4. Test EVAP purge valve
  5. Inspect CCV system

Repair notes

Diagnose and repair the root cause of excess fuel delivery on Bank 2.

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