IsItAGoodCar
Reliability Guide

Common Problems with the
2025 MG HS Mk2

In May 2025 MG expanded the HS Mk2 range with the self-charging Hybrid+, combining a 1.5-litre turbo petrol with a 146kW motor and 1.8kWh battery for 221bhp, alongside revised touchscreen response times.

What changed for 2025

  • •Introduction of self-charging HS Hybrid+ powertrain with 221bhp total output and 51.3mpg WLTP
  • •Hybrid+ utilises a 1.5 turbo engine, 146kW electric drive motor, and compact 1.8kWh battery pack
  • •Infotainment software update optimising boot times and climate control touch response latency
  • •Subtle suspension damper re-valving to improve secondary ride comfort over sharp road ridges

Common MOT watch-outs

  • !Front suspension lower wishbone rear bush wear from speed cushions on heavier hybrid models
  • !Brake disc face pitting on hybrid models driven predominantly in low-speed urban environments
  • !Forward camera and radar sensor alignment faults after windscreen replacement or grille removal
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Known Issues
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Serious
2
Moderate
1
Minor

All Known Issues

PHEV High-Voltage Battery Thermal Management Valve Seepage

ModerateCooling System

On HS PHEV models with the large 24.7kWh battery pack, the high-voltage battery cooling circuit diverter valve can develop slight weepage at the hose union clamps under high thermal loads.

Est. Repair Cost: £0 (Warranty / hose clamp tightening)
Warning Signs:

Low coolant warning message on digital cluster, Traces of blue/green hybrid coolant residue under undertray, PHEV EV mode temporarily restricted

What to Inspect:
  • Inspect secondary hybrid coolant expansion tank level under bonnet
  • Check underside of battery pack for coolant staining
Verified by IsItAGoodCar Research TeamUpdated

7-Speed DCT Low-Speed Roundabout Roll-On Hesitation

ModerateGearbox & Transmission

On 1.5 Turbo petrol variants with the 7-speed dual-clutch transmission, decelerating to 5mph for a roundabout followed by sudden throttle application can cause a 1-second clutch slip and hesitation.

Est. Repair Cost: £0 (Software TCM calibration update)
Warning Signs:

Engine revs flare briefly without vehicle accelerating when rolling into roundabouts, Clunky 2nd-to-1st downshift when braking to a halt

What to Inspect:
  • Test drive in suburban traffic with repeated rolling stops
  • Ask dealer if latest transmission software adaptation has been performed
Verified by IsItAGoodCar Research TeamUpdated

Dual 12.3-inch Screen Touchscreen Boot-Up Lag & Climate Control Latency

MinorInterior & Trim

Because physical climate buttons have been integrated into the digital touchscreen, boot-up lag during cold starts can delay defroster and cabin temperature adjustment by up to 20 seconds.

Est. Repair Cost: £0 (Software update)
Warning Signs:

Screen takes 15–20 seconds to boot on cold start, Climate control slider bar takes multiple taps to respond, Apple CarPlay disconnects when selecting reverse camera

What to Inspect:
  • Start car from cold and test rapid heater and fan speed adjustments immediately
  • Check for latest infotainment firmware
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2025 MG HS Mk2

  • Determine whether you need the 75-mile EV range of the PHEV or the plug-free convenience of the Hybrid+
  • Confirm that the vehicle has received the latest infotainment firmware flash for faster cold boot times
  • Check the service history for high-voltage hybrid inspection stamps and annual cooling system checks
20242026
Check a 2025 MG HS Mk2 by Registration