Turbocharger Cut-Off Valve

The electrically controlled valve that gives compressed intake air a path to escape or recirculate when the throttle closes. A valve that will not seal lets boost away while the engine expects the charge side to stay pressurised, so the symptom is usually intermittent power loss rather than a hard failure.

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 →

Fault Codes

• A8BD — Number-Plate Light Faulty
• 2C57 Charging Pressure Control, Plausibility Pressure Too Low
• 2C91 Blow-Off Valve, Mechanics: Suspicion That Blow-Off Valve Is Jammed Open
• A8BB Side Marker Light At Front Left Or Rear Right Faulty

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