IsItAGoodCar

Common Problems with the
2018–2020 MG MG3

We've identified 4 known issues that can affect the 2018–2020 MG MG3. 2 of these are serious faults that could be expensive to repair.

4
Known Issues
2
Serious
2
Moderate
0
Minor

The 2018–2020 period has 2 more issues than the MG MG3 average across all year periods.

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.

Estimated cost: £500–£900Affects: 2013–2024Often appears around: 40,000–70,000 miles

Typical symptoms

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

What to inspect before you buy

  • ✓Listen to the engine from cold
  • ✓Check service history for oil changes (critical for chain life)

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.

Estimated cost: £200–£400Affects: 2013–2020

Typical symptoms

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

What to inspect before you buy

  • ✓Test the clutch pedal feel and return action
  • ✓Check the clutch fluid level behind the pedal box

Thin Paint and Surface Rust

ModerateBodywork & Rust

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

Estimated cost: £150–£400Affects: 2013–2024

Typical symptoms

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

What to inspect before you buy

  • ✓Examine the roof and front end very closely for chips and orange specks

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.

Estimated cost: £150–£300Affects: 2013–2020

Typical symptoms

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

What to inspect before you buy

  • ✓Check the coolant expansion tank level
  • ✓Look for leaks at the bottom of the radiator

Buying Tips for the 2018 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.
2013–2017 MG MG32021–2024 MG MG3

Browse 2018–2020 MG MG3 in our Directory

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Other MG MG3 Year Periods

2013–20172018–20202021–2024

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