IsItAGoodCar
Reliability Guide

Common Problems with the
2020 MG MG3

Final year of the first-generation MG3. These newest examples are now over 5 years old, so expect minimal age-related wear if properly maintained.

What changed for 2020

  • •Final production year for first generation
  • •All models now include basic safety features as standard

Common MOT watch-outs

  • !Minor electronic glitches
  • !Brake wear on low-mileage examples
  • !Tyre pressure monitoring system warnings
4
Known Issues
2
Serious
2
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

Buying Tips for 2020 MG MG3

  • ✓Look for a full MG service history
  • ✓Test all electrical systems thoroughly
  • ✓Verify the coolant system is leak-free
2018–20192021–2024
Check a 2020 MG MG3 by Registration