SevereAffected: 2011-201870,000–120,000 miles

Ford Focus Mk3 2.0 TDCi — Alternator / Smart Charge System Failure

Modern vehicles use smart charging systems to reduce engine load, but the complex regulators on the alternators frequently fail.

Severity

Severe

DIY Difficulty

Moderate

Est. Cost

£250–£450

OBD Codes

P0620P0622

Component Diagram

Electrics

Typical layout and location for the Electrics assembly.

Reference Illustration

Symptoms

Red battery warning light on dashboard
'Charging System Fault' message
Systems shutting down (radio, power steering) as battery depletes
Car fails to start

Root Cause

The internal voltage regulator or diode pack on the alternator burns out due to heat and age. Occasionally, a slipping auxiliary belt causes the issue.

How To Fix

Test battery voltage with engine running (should be 13.8V - 14.7V).
If below 12.5V, replace the alternator.
Always replace the auxiliary drive belt at the same time.
Cost: £250-450

Estimated Repair Costs

Repair Option	Est. Cost (GBP)
DIY (parts only)	£100–£180
Independent Garage	£250–£450
Main Dealership	£400–£720

Other Faults on This Variant

Powershift Dual Clutch Gearbox Failure

Critical

2011-201550,000–100,000 miles£1800–£2500

The 6-speed Powershift (MPS6/6DCT450) automatic gearbox is notoriously fragile. Internal plastic parts shatter, clogging the transmission filter.

Steering Rack Motor Failure (EPS)

Critical

2011-201850,000–120,000 miles£800–£1200

The Electronic Power Steering rack on the Mk3 Focus suffers from water ingress, causing the motor to short out.

DPF Vaporiser Failure

Moderate

2011-201860,000–110,000 miles£250–£350

Ford uses a 5th injector (vaporiser) in the exhaust to regenerate the DPF. This vaporiser clogs with soot, preventing regeneration.

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