IsItAGoodCar
Reliability Guide

Common Problems with the
2016–2018 Ford Focus Mk3 (C346)

We've identified 2 known issues that can affect the 2016–2018 Ford Focus Mk3 (C346). 1 of these are serious faults that could be expensive to repair.

2
Known Issues
1
Serious
0
Moderate
1
Minor

All Known Issues

1.0 EcoBoost Wet Belt & Cooling

SeriousEngine

Timing belt degradation and degas hose failure. Catastrophic engine risk.

Est. Repair Cost: £1,200–£4,000
Warning Signs:

Low oil pressure warning, Engine rattle, Coolant loss

What to Inspect:
  • Oil service history
  • Recall status for cooling hose
Verified by IsItAGoodCar Research Team

Rear Bumper Vent Leaks

MinorBodywork & Rust

Water enters the boot through failed seals on the cabin pressure vents behind the rear bumper.

Est. Repair Cost: £100–£250
Warning Signs:

Wet boot carpet, Mist on inside of windows, Water in spare wheel well

What to Inspect:
  • Check the side carpets in the boot for dampness
Verified by IsItAGoodCar Research Team

Buying Tips for 2016–2018 Ford Focus Mk3 (C346)

  • ✓Avoid the Powershift dual-clutch automatic transmission (particularly on petrol models) due to widespread, expensive failures with the clutch packs and TCM.
  • ✓On 1.0 EcoBoost models, demand proof that the exact Ford-spec oil was used, as the wrong oil degrades the wet-belt and destroys the engine.
  • ✓Check the coolant reservoir on 1.0 EcoBoost models; early cars suffered from cracked 'degas' hoses that lead to sudden coolant loss and engine fires.
  • ✓Test the steering rack; if it feels heavy or notches when turning, the electric power steering (EPAS) rack may need an expensive replacement.
  • ✓Listen for a 'clunk' from the front suspension when pulling away or braking, which usually points to worn lower control arm bushes.
  • ✓Verify the SYNC infotainment system (if fitted) doesn't freeze or lag, as early SYNC 1 and 2 units are prone to software glitches.
2012–2015
Check a 2016–2018 Ford Focus Mk3 (C346) by Registration