MG4
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Which Mg MG4 engine is the most reliable? See common problems, reviews and reliability verdicts across generations and engines.
Frequently asked questions
Which Mg MG4 engine is the most reliable?
MG4 rear motor (LFP) — Maint. Sensitive verdict. EH32 is the platform code, not a motor part number. The rear motor and the LFP pack are not what the MG4 forum is full of. MGEVs thread 16053: the two 12V faults owners keep separating are terminals left loose at pre-delivery — early cars were shipped with the battery unhooked for the boat, and the clamps were not always tightened — and software that did not let the traction pack top the 12V up unless the car was driving or plugged in. A later gateway update is what owners say changed the second one. Resting voltage on a healthy car in those threads sits around 12.5–12.8 V and rises to about 14.2–14.4 V while it is being charged, so a charger that stops there is the car working, not a reason to fit a lithium battery the DC-DC was not set up for. One owner was told by the AA patrol that the Chinese 12V batteries were poor; a Bosch was fitted and the dealer refunded it, and that car then stayed reliable for two years. That is one patrol's opinion and one cure, not a rule that every factory battery is scrap. Thread 26062 is a single Urban that still died after a battery test and a parasitic-drain test both passed. Separately, the plastic undertray sags or splits. MG's own bulletin is titled 'Subframe lower guard to battery gap', and dealers were told to fix it when the customer complains. One UK car shed the tray at 70 mph. The motor is the quiet part.
Which Mg MG4 engines should you avoid?
None of the Mg MG4 engines listed are rated "Problematic" or "Avoid" — but always check the service history before buying.
What are the most common Mg MG4 problems?
The most commonly reported problems across all Mg MG4 generations and engines: 12V goes flat: loose clamps, or the car never tops it up, Undertray sags, and one split at motorway speed, One Urban still died after the battery tested fine.