IsItAGoodCar
Reliability Guide

Common Problems with the
2021–2024 MG MG3

We've identified 2 known issues that can affect the 2021–2024 MG MG3. 1 of these are serious faults that could be expensive to repair.

2
Known Issues
1
Serious
1
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

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

Buying Tips for 2021–2024 MG MG3

  • ✓Listen for a rattle from the engine on cold starts, which can indicate timing chain stretch.
  • ✓Inspect the paintwork carefully, especially on the roof and around the windscreen for signs of early corrosion.
  • ✓Check all infotainment functions; the system is known for being laggy and occasionally freezing.
2020
Check a 2021–2024 MG MG3 by Registration