Mazda 6 (GL) Common Problems & Reliability
The final iteration of the third-generation Mazda 6 (GL), produced from 2018 to 2023, represented the model at its most refined and luxurious. This "second facelift" introduced a completely redesigned interior that brought it closer to premium German rivals, featuring high-quality leather, wood trim, and significantly improved sound insulation. In the UK, it remained a stalwart of the large family car segment, prized by private buyers and long-distance drivers for its elegant styling, tactile driving experience, and the addition of a more powerful 2.5-litre petrol engine to the range. Reliability for the GL-generation is generally better than the earlier GJ models, as Mazda addressed many of the teething issues with the Skyactiv technology. The petrol engines, particularly the 2.0-litre and the smooth 2.5-litre, are exceptionally durable and benefit from simplified maintenance schedules. However, while improved, the 2.2-litre Skyactiv-D diesel still requires close scrutiny; it remains sensitive to short-trip usage and requires high-quality servicing to avoid DPF and carbon buildup issues. Another common area for attention is the Bose sound system amplifier located under the seat, which can fail if water ingress occurs from blocked sunroof or door drains. When buying a used GL Mazda 6 in the UK, the 2.0-litre petrol (165PS) or the 2.5-litre (194PS) automatic are the most recommended choices for a trouble-free experience. Prospective owners should verify that the infotainment system has the latest firmware—supporting Apple CarPlay and Android Auto—and listen for any "knocking" from the rear suspension over bumps, which can indicate worn drop links. Check the condition of the paint and alloy wheels carefully, as they are still the car's most vulnerable cosmetic points. A well-maintained GL model offers a level of prestige and driver engagement that is hard to find elsewhere in the used family car market.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common Mazda 6 (GL) Faults & Repair Costs
2.2 SkyActiv-D EGR / DPF Problems
Later diesels still clog the EGR and DPF if used for short trips, bringing limp mode and costly forced-regeneration visits.
DPF warning lights, Limp mode, Repeated regeneration attempts
- Ask about journey profile and whether the car has needed forced regenerations
i-ELOOP Capacitor Failure
The energy recovery capacitor can fail, which disables the i-stop system and triggers a dashboard warning.
i-ELOOP warning message, Battery not charging correctly, i-stop unavailable
- Check for charging system warnings on the dashboard
Boot Seal Water Ingress
Water can creep past rear lamp seals or boot-area vents, leaving a damp spare-wheel well and occasional condensation issues.
Condensation in boot area, Wet boot floor, Musty smell after rain
- Lift the boot floor and feel around the spare-wheel well and side trims
Buying a used Mazda 6 (GL)? Always check for hidden finance and write-off history.
Mechanical problems are only half the battle. Over 1 in 3 UK used cars checked have unpaid finance or accident write-off records that could cause you to lose the car or thousands in value.