Mercedes-Benz A-Class Common Faults & Problems (UK Buyer's Guide)
W176 (2012–2018) & W177 (2018–) · Hatchback
This is an independent guide to the Mercedes-Benz A-Class, written for used car buyers rather than sellers. The faults below come from owner reports, UK garage patterns and MOT history for this generation — not manufacturer marketing, and we take no commission from any dealer. Use it to spot the expensive problems before you hand over money.
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Common Faults
Each fault below is drawn from real owner reports and UK garage patterns for this generation — not generic used-car advice.
7G-DCT dual-clutch gearbox
seriousMercedes' 7-speed DCT can fail — jerky shifts, warning light.
Check for: Any hesitation or clunk on the test drive.
Typical cost: £1,800–£3,500
MBUX infotainment glitches (W177)
minorMBUX can freeze or lose the touchscreen.
Check for: Test all screen inputs and voice control.
Typical cost: Dealer software update
Rear suspension corrosion (W176)
moderateOlder W176 rear axle/arm corrosion.
Check for: Underbody inspection.
Typical cost: £400+ treatment
What to Check Before Buying
Take this list to the viewing. Every point comes straight from the faults above.
- 7G-DCT dual-clutch gearbox: Any hesitation or clunk on the test drive.
- MBUX infotainment glitches (W177): Test all screen inputs and voice control.
- Rear suspension corrosion (W176): Underbody inspection.
MOT history red flags
If any of these appear on the last two MOTs, negotiate hard or walk away.
- 'Suspension arm corroded' advisory
Sharp questions to ask the seller
- DCT: any warning lights, ever?
- Full Mercedes or specialist service history?
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