MG MG4 Common Problems & Reliability
The MG4 EV, launched in 2022, has been an absolute disruptor in the UK electric vehicle market, offering rear-wheel-drive dynamics and class-leading battery range at a price point that undercuts almost all of its European rivals. Built on a dedicated EV platform (the Modular Scalable Platform), it represents a huge step forward for the brand compared to the older ZS EV, offering sharp styling and a minimalist interior. In the UK, it is highly prized for its exceptional value for money and genuinely engaging handling, making it a favorite for both private buyers and company car fleets. However, the MG4’s reputation as a budget champion is somewhat marred by a series of frustrating "teething" issues and software glitches that have plagued early production models. Owners frequently report sluggish or freezing infotainment screens, and the Lane Keep Assist (LKA) system is notoriously over-intrusive, often requiring a software update to behave predictably. Additionally, there have been some reports of the onboard AC charger failing, which prevents home charging, and minor build quality complaints regarding thin exterior paint and interior trim rattles over broken UK roads. When buying a used MG4 in the UK, it is absolutely essential to verify that the car has a full MG main dealer service history to maintain the crucial 7-year/80,000-mile warranty. Prospective owners should ask for a battery "State of Health" (SOH) report, especially on older or high-mileage examples, and thoroughly test the touchscreen to ensure it is running the latest software version. It is also important to test drive the car to evaluate the Lane Keep Assist system and ensure there are no "HV System" warning lights on the dashboard. Despite the electronic niggles, a well-maintained MG4 remains one of the most compelling and affordable ways to transition to electric motoring.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common MG MG4 Faults & Repair Costs
Aggressive Lane Keep Assist (LKA)
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.
Steering "yanking" unexpectedly, Intrusive beeping, Car drifting towards oncoming traffic
Rear Drive Unit Oil Leak
Some early MG4 models have suffered from oil leaks from the rear motor/drive unit.
Oil spots on the ground under the rear axle, Warning light on dash
Infotainment Screen Blackouts
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.
Screen going black while driving, Touchscreen unresponsive, Need to hold power button to restart
Brake Squealing
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.
High-pitched squeal when braking, Squeaking at low speeds, Grinding noise after the car has been parked
12V Battery Drainage
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.
Car won't start, Multiple warning messages, Keyless entry failing
Buying a used MG MG4? Always check for hidden finance and write-off history.
Mechanical problems are only half the battle. Over 1 in 3 UK used cars checked have unpaid finance or accident write-off records that could cause you to lose the car or thousands in value.