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MG Gs Problems & Known Issues

The most common MG Gs problems ranked by severity — what to watch for, what it costs to fix, and what happens if you ignore it.

Generations

MK1 — First Generation
2016–2019
1.5 Turbo, 1.5 Naturally Aspirated

Top issues to watch for

The most serious MG Gs problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.

Major
Electronic Stability Control system malfunction
MK12016–201920k–80k miles
The Electronic Stability Control (ESC) system frequently develops software or sensor faults that trigger the malfunction indicator light. This affects the vehicle's stability assistance during emergency manoeuvres and is an MOT failure item. The fault pattern suggests either inadequate software calibration or premature sensor degradation in the early production years of this model.
What happens if ignoredThe ESC system will not function correctly during emergency situations, reducing the vehicle's ability to maintain stability. This is an automatic MOT failure and the car should not be driven in adverse weather conditions. Repair typically involves sensor replacement or ECU reprogramming.
Independent garage
£200–£400
Specialist
£250–£450
Main dealer
£400–£700
Parts only
£150–£300
Major
Premature brake disc wear and cracking
MK12016–20190k–80k miles
Brake discs develop excessive wear, cracking, or fractures at unusually low mileages, even on nearly new vehicles. This suggests either inadequate disc specifications for the vehicle's weight or poor quality metallurgy in the original equipment discs. The issue affects safety-critical braking performance.
What happens if ignoredCracked or excessively worn discs can fail completely under heavy braking, causing total loss of braking on that axle. This represents a serious safety hazard and will result in immediate MOT failure. Complete disc replacement is required.
Independent garage
£200–£400
Specialist
£250–£450
Main dealer
£400–£600
Parts only
£120–£250
Major
Coil spring fracture
MK12016–20190k–40k miles
Coil springs fracture or seriously weaken at very low mileages, including on nearly new vehicles. This indicates either design issues with spring specifications or manufacturing defects in the spring steel. A fractured spring affects vehicle handling and ride height.
What happens if ignoredA fractured spring can cause sudden loss of vehicle control, particularly during cornering or emergency manoeuvres. The sharp end of a broken spring can also damage the tyre. This is an immediate MOT failure and the vehicle should not be driven until repaired.
Independent garage
£150–£300
Specialist
£200–£350
Main dealer
£300–£500
Parts only
£80–£150
Minor
Warning system malfunction
MK12016–201920k–80k miles
Multiple warning systems experience malfunctions that cause warning lights or audible alerts to activate incorrectly. This covers various dashboard warning indicators beyond the ESC system and suggests broader electrical integration issues in the early production vehicles.
What happens if ignoredFalse warnings can mask genuine safety issues and create driver distraction. While not immediately dangerous, these faults will cause MOT failure and may indicate underlying electrical problems that could develop further.
Independent garage
£150–£300
Specialist
£200–£350
Main dealer
£300–£500
Parts only
£100–£200

1 more known issues tracked

Including wear items, electrical niggles, and generation-specific problems.

MOT failure hotspots

Based on DVSA MOT test data. These are the items where the MG Gs fails at a significantly higher rate than the average car.

ABS fault
Brakes · 0-20k miles
MOT failure rate: 26x the fleet average
Sample: 484 tests
Headlight fault
Lights & Electrics · 20-40k miles
MOT failure rate: 20x the fleet average
Sample: 2,507 tests
Light unit fault
Lights & Electrics · 20-40k miles
MOT failure rate: 17x the fleet average
Sample: 2,404 tests
Tyre wear or damage
Tyres · 60-80k miles
MOT failure rate: 8.2x the fleet average
Sample: 771 tests
Coil springs broken
Suspension · 0-20k miles
MOT failure rate: 6.7x the fleet average
Sample: 484 tests
Excessive fluctuation in brake effort through e...
Brakes · 40-60k miles
MOT failure rate: 5.0x the fleet average
Sample: 314 tests

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Related

MG Gs reliability FAQs

What are the most common problems with the MG Gs?

The MG Gs has 5 known issues across 2 severity levels. The most common problems relate to Electronic Stability Control system malfunction and Premature brake disc wear and cracking.

Is the MG Gs reliable?

The MG Gs has 0 dangerous and 3 major known issues. No dangerous issues are tracked, which is a positive sign.

How much does it cost to fix MG Gs problems?

Repair costs range widely. The most significant issue (Electronic Stability Control system malfunction) costs £200–£400 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.