17535/P1127/004391 - Fuel Trim; Bank 1 (Mult): System too Rich

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17535/P1127/004391 - Fuel Trim; Bank 1 (Mult): System too Rich

Possible Symptoms

  • Malfunction Indicator Light (MIL) active
  • Reduced fuel economy and engine performance

Possible Causes

  • Cylinder misfires
  • Spark Plugs
    • Old or worn out plugs
    • Incorrect type for engine
  • Fuel Injectors
    • Leaking
    • Dirty, poor spray pattern
  • Weak ignition system, coil(s), plug wires
  • Fuel Pressure
  • Boost leak
  • EVAP Purge Valve (N80)
  • MAF (G70)
  • O2 Sensor(S)
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