IsItAGoodCar
Reliability Guide

Common Problems with the
2017 Ford Fiesta Mk8 (B479)

The Mk8 Fiesta launched in 2017 with a roomier cabin, a much better interior and a five-star Euro NCAP score. It stayed Britain's favourite supermini, sold as a three-door and five-door with the 1.0 EcoBoost as the mainstream engine.

What changed for 2017

  • •All-new B479 body on the global B-car platform, with a longer wheelbase and wider track
  • •1.1 Ti-VCT 70 and 85PS, 1.0 EcoBoost 100, 125 and 140PS, and 1.5 TDCi 85 and 120PS
  • •Five-speed manual on the 1.1, six-speed manual elsewhere, and a six-speed automatic option
  • •Trend, Zetec, Titanium, ST-Line and Vignale trims, with the Active crossover joining in 2018

Common MOT watch-outs

  • !Rear coil springs breaking, a recurring advisory on UK cars
  • !Worn front lower arm rear bushes causing uneven tyre wear
  • !Corroded brake discs and pipes on low-mileage town cars
3
Known Issues
2
Serious
0
Moderate
1
Minor

All Known Issues

1.0 EcoBoost Wet Belt Degradation

SeriousEngine

Early Mk8 1.0 EcoBoost engines still use the oil-bath timing-belt setup that sheds material if servicing or oil quality is wrong, eventually starving the engine of oil pressure.

Est. Repair Cost: £900–£3,500
Warning Signs:

Low oil pressure warning, Rattle from the timing end, Rubber debris in oil or filter

What to Inspect:
  • Demand full service history with the correct Ford-spec oil
  • Check whether the belt has already been replaced
  • Be wary of sellers who cannot explain the engine version clearly
Verified by IsItAGoodCar Research Team

Coolant Bottle, Hose and Thermostat Leaks

SeriousCooling System

Expansion tanks, hoses and thermostat housings can leak coolant gradually, and ignored low-level warnings risk overheating and head-gasket or engine damage.

Est. Repair Cost: £120–£900
Warning Signs:

Low coolant warning, Pink staining around hoses or bottle, Sweet smell or occasional overheating

What to Inspect:
  • Inspect the expansion tank, hose joints and thermostat area from cold
  • Check for unexplained coolant top-ups in the history
  • Avoid cars with recent overheating excuses
Verified by IsItAGoodCar Research Team

SYNC 3 and Door-Latch Electrical Glitches

MinorElectrics & Electronics

Minor but common ownership irritations include touchscreen freezes, Bluetooth dropouts and door-latch or locking issues that have featured in Ford service actions.

Est. Repair Cost: £0–£350
Warning Signs:

Frozen infotainment screen, Phone pairing drops, Door will not latch or unlock consistently

What to Inspect:
  • Use media, navigation and phone functions on the drive
  • Open and close every door repeatedly
  • Check dealer history for software or latch campaign work
Verified by IsItAGoodCar Research Team

Buying Tips for 2017 Ford Fiesta Mk8 (B479)

  • On pre-2019 1.0 EcoBoost cars, insist on evidence of the correct oil and the wet belt condition
  • Check the coolant expansion tank seam and hose joints for pink staining
  • Test the SYNC 3 screen, Bluetooth and both USB ports through a full ignition cycle
2018–2019
Check a 2017 Ford Fiesta Mk8 (B479) by Registration