IsItAGoodCar
Reliability Guide

Common Problems with the
2023 MG MG4

Mid-cycle models benefit from software updates and improved build quality. These are often the best value examples, offering the full MG4 experience with fewer teething issues.

What changed for 2023

  • •Introduction of Extended Range models
  • •Updated infotainment software
  • •Revised suspension tuning

Common MOT watch-outs

  • !Continued 12V battery issues on some examples
  • !Infotainment glitches requiring updates
  • !Brake corrosion on low-mileage cars
5
Known Issues
1
Serious
2
Moderate
2
Minor

All Known Issues

Rear Drive Unit Oil Leak

SeriousGearbox & Transmission

Some early MG4 models have suffered from oil leaks from the rear motor/drive unit.

Est. Repair Cost: £0 (Warranty)
Warning Signs:

Oil spots on the ground under the rear axle, Warning light on dash

What to Inspect:
  • Inspect the rear motor area for any signs of wetness or drips
Verified by IsItAGoodCar Research Team

Infotainment Screen Blackouts

ModerateElectrics & Electronics

The central touchscreen can go black or freeze during driving, sometimes requiring a full system restart. This is a known software issue addressed by updates.

Est. Repair Cost: Software Update / £0
Warning Signs:

Screen going black while driving, Touchscreen unresponsive, Need to hold power button to restart

What to Inspect:
  • Ensure the latest software version is installed
  • Test the screen for extended period during test drive
Verified by IsItAGoodCar Research Team

12V Battery Drainage

ModerateElectrics & Electronics

Like many EVs, the 12V battery can fail or drain prematurely, preventing the car from entering "Ready" mode. This has been a common complaint on early models.

Est. Repair Cost: £120–£200
Warning Signs:

Car won't start, Multiple warning messages, Keyless entry failing

What to Inspect:
  • Check the age and health of the 12V battery
  • Ask if an AGM battery upgrade has been fitted
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Aggressive Lane Keep Assist (LKA)

MinorSteering

The LKA system on early software can provide sudden and intrusive steering inputs. Which? found it could pull the car onto the wrong side of the road. Software updates have improved this significantly.

Est. Repair Cost: Software Update / £0
Warning Signs:

Steering "yanking" unexpectedly, Intrusive beeping, Car drifting towards oncoming traffic

What to Inspect:
  • Check software version (R33 or later is much improved)
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Brake Squealing

MinorBrakes

Many MG4 owners report persistent brake squeaking, especially at low speeds. This is partly due to the regenerative braking system meaning the physical brakes are used infrequently, leading to surface corrosion.

Est. Repair Cost: £0–£100
Warning Signs:

High-pitched squeal when braking, Squeaking at low speeds, Grinding noise after the car has been parked

What to Inspect:
  • Listen for brake noise during test drive
  • Inspect brake discs for corrosion
Verified by IsItAGoodCar Research Team

Buying Tips for 2023 MG MG4

  • ✓Ask if all software updates have been applied
  • ✓Test the infotainment system thoroughly
  • ✓Check the brake discs for corrosion