IsItAGoodCar
Reliability Guide

Common Problems with the
2017 MG MG3

Mid-cycle models benefit from improved build quality but still carry the same water ingress and clutch weaknesses. These are often the best value examples if well maintained.

What changed for 2017

  • •Minor equipment upgrades
  • •Revised interior trim options
  • •Updated infotainment system

Common MOT watch-outs

  • !Radiator leaks becoming more common
  • !Clutch master/slave cylinder failures
  • !Door seal deterioration
5
Known Issues
2
Serious
3
Moderate
0
Minor

All Known Issues

Engine Timing Chain Stretch

SeriousEngine

The metal timing chain can stretch over time, leading to rattling noises and, if ignored, catastrophic engine failure.

Est. Repair Cost: £500–£900
Warning Signs:

Metallic rattling on cold start, Check engine light, Rough idling

What to Inspect:
  • Listen to the engine from cold
  • Check service history for oil changes (critical for chain life)
Verified by IsItAGoodCar Research Team

Clutch Pedal Failure

SeriousGearbox & Transmission

Some MG3 owners have reported the clutch pedal suddenly dropping to the floor and not returning. The cause is typically a failed clutch master or slave cylinder.

Est. Repair Cost: £200–£400
Warning Signs:

Clutch pedal drops to the floor, Gears difficult to select, No bite point

What to Inspect:
  • Test the clutch pedal feel and return action
  • Check the clutch fluid level behind the pedal box
Verified by IsItAGoodCar Research Team

Thin Paint and Surface Rust

ModerateBodywork & Rust

Owners often report thin paint that chips easily, leading to surface rust if not treated quickly.

Est. Repair Cost: £150–£400
Warning Signs:

Rust spots on the roof edge, Corrosion around the windscreen seal

What to Inspect:
  • Examine the roof and front end very closely for chips and orange specks
Verified by IsItAGoodCar Research Team

Leaking Radiator

ModerateCooling System

The radiators on some MG3s are prone to developing leaks, which can lead to overheating if coolant levels are not monitored.

Est. Repair Cost: £150–£300
Warning Signs:

Coolant smell after a drive, Visible pink/orange staining on the radiator, Rising temp gauge

What to Inspect:
  • Check the coolant expansion tank level
  • Look for leaks at the bottom of the radiator
Verified by IsItAGoodCar Research Team

Door Seal Water Ingress

ModerateBodywork & Rust

Early MG3 models have been known to let water in through door seals, leading to damp carpets and a musty smell inside the cabin.

Est. Repair Cost: £50–£150
Warning Signs:

Wet carpets after rain, Musty smell in the cabin, Dampness around door pillars

What to Inspect:
  • Check the front and rear door seals for gaps or deterioration
  • Inspect the carpets and underlay for dampness
Verified by IsItAGoodCar Research Team

Buying Tips for 2017 MG MG3

  • ✓Check the coolant expansion tank level regularly
  • ✓Look for evidence of clutch replacement
  • ✓Inspect the door seals for any signs of wear
2014–20162018–2019
Check a 2017 MG MG3 by Registration