CKFCar Known Faults
CriticalAffected: 2006-201340,000–100,000 miles

Mini Hatch R56 Cooper S 1.6T 175bhp — Timing Chain Tensioner Failure (N14 Engine)

The BMW-designed N14 1.6T engine in the R56 Mini Cooper S has a plastic timing chain tensioner that fails prematurely. This is the most serious known fault on the R56 generation.

Severity

Critical

DIY Difficulty

Professional Only

Est. Cost

£1000–£1800

OBD Codes

P0016P0017P0011
Component Diagram

Timing Chain

Typical layout and location for the Timing Chain assembly.

Timing Chain diagram
Reference Illustration

Symptoms

  • Rattling from engine on cold start, louder in cold weather
  • EML with timing chain correlation codes
  • Loss of power and misfires
  • In catastrophic failure: engine stops, cannot be restarted
  • Metallic noise from top of engine

Root Cause

The N14 uses a plastic single-vane timing chain tensioner that loses tension as it wears. The chain then slaps against the guides. Combined with carbon build-up on the intake valves (direct injection + PCV system), the engine suffers from multiple compounding issues.

How To Fix

  1. Replace timing chain, tensioner, guides and sprockets as a complete kit
  2. Also check for oil leaks from valve cover — refit gasket at same time
  3. Carbon clean intake valves while the engine is partially disassembled
  4. Genuine BMW Mini parts for this — pattern parts have been known to fail prematurely
  5. Total repair: £1,000-1,800 at a specialist

Estimated Repair Costs

Repair OptionEst. Cost (GBP)
DIY (parts only)£400–£720
Independent Garage£1000–£1800
Main Dealership£1600–£2880

Other Faults on This Variant

Carbon Build-Up on Intake Valves

Moderate
2006-201340,000–80,000 miles£300–£600

The N14's direct injection system means fuel is injected directly into the cylinder, bypassing the intake valves. Oil vapour from the PCV system coats the valves with carbon, causing power loss and misfires.

High Pressure Fuel Pump (HPFP) Failure

Severe
2006-201050,000–100,000 miles£600–£900

The High Pressure Fuel Pump on the N14 engine fails frequently. It is one of the most well-known and expensive failures on the R56 Cooper S.

Turbo Oil Feed Pipe Leak

Critical
2006-201350,000–100,000 miles£200–£300

The oil feed line to the turbocharger runs directly over the exhaust manifold. The extreme heat cooks the rubber O-rings in the banjo fittings, causing dangerous oil leaks.

Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.