BMW Fueling / HPFP Fault Codes
High pressure fuel pump, rail pressure, port injection codes.
8 codes in this category.
29F0Mixture Adaptation Limit Lean Bank 1Long term fuel trim hitting positive limit - lean condition.moderateP0171System Too Lean (Bank 1)Lean condition - usually vacuum leak or weak fuel delivery.moderateP0174System Too Lean (Bank 2)Bank 2 lean - V engines only.moderate2EF8High Pressure Fuel Pump InsufficientHPFP not maintaining rail pressure - the famous N54 HPFP failure.criticalP0087Fuel Rail Pressure Too LowFuel rail not maintaining pressure under load - HPFP suspect on direct injection.criticalP0193Fuel Rail Pressure Sensor HighFuel pressure sensor reading abnormally high - sensor or regulator fault.highP2096Post Catalyst Fuel Trim LeanPost-cat O2 trim leaning - exhaust leak between cat and rear sensor.low26B7Fuel Pressure Sensor PlausibilityFuel pressure sensor reading inconsistent.moderate