IsItAGoodCar
Reliability Guide

Common Problems with the
2020 Ford Fiesta Mk8 (B479)

For 2020 Ford dropped the 1.5 TDCi diesel and slimmed the petrol range, leaving the 1.0 EcoBoost 125 and the new 155PS mild hybrid. The 155 came with a seven-speed dual-clutch automatic.

What changed for 2020

  • •1.0 EcoBoost 155PS mild hybrid with a belt-driven starter-generator and 48V battery
  • •Seven-speed dual-clutch automatic offered and later made standard on the 155PS
  • •1.5 TDCi diesel removed from the UK range during 2020
  • •1.1 Ti-VCT 70PS and the 1.0 EcoBoost 100 and 140PS versions dropped

Common MOT watch-outs

  • !Rear springs and suspension bushes still the most common wear advisories
  • !Smoke and DPF faults on the last 1.5 TDCi cars used for short urban trips
  • !Tyre damage and uneven wear on 17 and 18-inch ST-Line wheels
2
Known Issues
1
Serious
0
Moderate
1
Minor

All Known Issues

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 2020 Ford Fiesta Mk8 (B479)

  • Check the 48V battery and starter-generator for stored faults, and confirm stop-start works
  • Drive the seven-speed automatic slowly in traffic, feeling for hesitation or shunting
  • Ask for the service invoice showing the correct Ford oil specification for the EcoBoost
2018–20192021
Check a 2020 Ford Fiesta Mk8 (B479) by Registration