2C57 Charging Pressure Control, Plausibility Pressure Too Low

The DME compared requested boost with measured charge pressure and found the measured value implausibly low. It records that the charge-air side did not build or hold the pressure the engine management system asked for; it does not name the part responsible.

Common causes on MINI

• Boost leak in the charge-air path, including hoses and clamps
• Cut-off, diverter or blow-off valve not sealing or stuck open
• Wastegate control fault
• Charge-air pressure sensor reading incorrectly
• Turbocharger mechanical wear

Documented repairs

2016 MINI Countryman ALL4 Power Loss Reveals a Drain-Plug Oil Leak

2016 MINI Countryman S (R60, N18 1.6L Turbo)

2C572C91A8BBA8BD

A power-loss complaint on a 2016 MINI Countryman S ALL4 exposed a blinking oil-pressure warning and a leaking drain plug. Fault 2C91 pointed to the turbo cut-off valve.

Read the diagnosis →

Components

• Engine Oil
• Engine Oil Drain Plug
• Turbocharger Cut-Off Valve

Engines

• N18 1.6L Turbo

Models

• R60 MINI Countryman S

Repairs by System

• Diagnosis
• Engine
• Oil Leak
• Turbocharger

Symptoms

• Check Engine Light
• Oil Leak
• Intermittent Power Loss
• Low Engine Oil Level
• Oil Pressure Warning

Procedures

• Fault Code Scan
• Road Test
• Engine Oil Drain Plug Replacement
• Engine Oil Level Inspection
• Engine Oil Refill
• Underbody Leak Inspection