IsItAGoodCar
Reliability Guide

Common Problems with the
2018 Mazda 6 (GL)

The GL Mazda 6 launched in the UK with a completely redesigned interior bringing it closer to premium German rivals. The 2.0 and 2.5 SkyActiv-G petrol engines proved exceptionally reliable.

What changed for 2018

  • •UK launch of GL-generation Mazda 6
  • •Completely redesigned interior with premium materials
  • •2.5-litre SkyActiv-G petrol engine introduced
  • •Improved sound insulation and refinement

Common MOT watch-outs

  • !i-ELOOP capacitor failure
  • !Boot seal water ingress
  • !2.2 diesel EGR and DPF problems
3
Known Issues
1
Serious
1
Moderate
1
Minor

All Known Issues

i-ELOOP Capacitor Failure

SeriousElectrics & Electronics

The energy recovery capacitor can fail, which disables the i-stop system and triggers a dashboard warning.

Est. Repair Cost: £800–£1,200
Warning Signs:

i-ELOOP warning message, Battery not charging correctly, i-stop unavailable

What to Inspect:
  • Check for charging system warnings on the dashboard
Verified by IsItAGoodCar Research Team

2.2 SkyActiv-D EGR / DPF Problems

ModerateExhaust & Emissions

Later diesels still clog the EGR and DPF if used for short trips, bringing limp mode and costly forced-regeneration visits.

Est. Repair Cost: £300–£1,200
Warning Signs:

DPF warning lights, Limp mode, Repeated regeneration attempts

What to Inspect:
  • Ask about journey profile and whether the car has needed forced regenerations
Verified by IsItAGoodCar Research Team

Boot Seal Water Ingress

MinorBodywork & Rust

Water can creep past rear lamp seals or boot-area vents, leaving a damp spare-wheel well and occasional condensation issues.

Est. Repair Cost: £0–£200
Warning Signs:

Condensation in boot area, Wet boot floor, Musty smell after rain

What to Inspect:
  • Lift the boot floor and feel around the spare-wheel well and side trims
Verified by IsItAGoodCar Research Team

Buying Tips for 2018 Mazda 6 (GL)

  • ✓Late 2.0 and 2.5 petrols are the safest buys; treat any 2.2 diesel as a specialist purchase.
  • ✓Check the 360 camera, parking sensors and electric seat functions on high-spec GT Sport Tech cars.
  • ✓Inspect the boot floor and rear lamp area for signs of past water ingress.
2019
Check a 2018 Mazda 6 (GL) by Registration