Ford Fiesta Mk6 1.25 82bhp — Timing Chain Tensioner Rattle (Duratec)
The 1.25 Duratec petrol engine develops a timing chain rattle on cold starts at higher mileages. The hydraulic tensioner loses pressure overnight, causing a brief rattle until oil pressure builds.
Severity
ModerateDIY Difficulty
Hard
Est. Cost
£400–£600
OBD Codes
P0016P0017Timing Chain
Typical layout and location for the Timing Chain assembly.
Symptoms
- Rattling from top of engine on cold start only
- Noise disappears after 5-10 seconds as oil pressure builds
- More pronounced in cold weather
- EML rarely triggered unless timing correlation is off
Root Cause
The chain tensioner is hydraulically actuated and relies on oil pressure. When the engine is cold and oil has drained back from the tensioner, there is a brief moment of slack. Worn chains and guides amplify the noise.
How To Fix
- If noise disappears quickly when warm — monitor and change oil regularly (every 6,000 miles max)
- If noise persists or gets louder: full chain kit replacement
- Use 5W-30 fully synthetic to reduce cold-start pressure delay
- Chain kit: £150-300 parts. Fitted: £400-600
Estimated Repair Costs
| Repair Option | Est. Cost (GBP) |
|---|---|
| DIY (parts only) | £160–£240 |
| Independent Garage | £400–£600 |
| Main Dealership | £640–£960 |
Other Faults on This Variant
Front Wheel Bearing Failure
ModerateFront wheel bearing wear is extremely common on the Mk6 Fiesta. Most examples will need at least one bearing replaced between 60,000 and 100,000 miles.
Power Steering Pump Failure
ModerateThe hydraulic power steering pump on the Mk6 Fiesta fails with age and mileage, making the steering very heavy — especially at low speeds and when parking.
Ignition Coil Pack Failure
ModerateThe single coil pack block fails, causing a 2-cylinder misfire.
Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.