Thinking about buying a used MG MG3 (2017–2024) in New Zealand? We've documented 6 known faults for this model spanning interior, engine, transmission, and electrical. Each researched and verified before it's published. The most serious issues here are rated critical. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
6
Documented faults
Critical
Most serious
$0–$400
Typical repair
4
Systems covered
Known MG MG3 faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
01Driver's seat rail can unlock in a crash - safety recall REC-006468
CriticalCommonInterior $0–$150 to fix
Australian recall REC-006468 (November 2025) covers about 10,516 new-generation MG3s built March 2024 to July 2025, after Euro NCAP crash testing showed the driver's seat sliding forward 111.5mm when the inner rail unlocked mid-impact, raising injury risk. Dealers fit an additional component to the seat rail in a 30-60 minute free repair, and the campaign is current, not expired. Any 2024-2025 MG3 (petrol or Hybrid+) offered for sale in NZ should have proof this work is done.
Symptoms to notice
No symptoms in normal driving - latent crash-safety defect
Recall notice letter from MG
What to check
Take the VIN from the windscreen or door jamb and check it on vehiclerecalls.gov.au or with an MG NZ dealer before buying. Ask to see the dealer invoice or service book stamp showing the seat rail component was fitted; do not accept 'it's booked in' as done.
Where to look: Driver's seat rails / floor mounting
Ask the seller
“Has the driver's seat rail recall REC-006468 been completed on this car?”
“Can you show the dealer paperwork for the recall repair?”
“Has MG contacted you about any other outstanding campaigns?”
02Phantom ABS/TPMS warning lights and self-unlocking doors
MinorCommonElectrical $150–$900 to fix
Documented pattern faults on the 2017-2023 MG3 include ABS and tyre-pressure warning lights illuminating for no reason — faulty wheel speed sensors are the usual culprit — plus dash display failures and central locking that fails to lock or unlocks the car by itself. A separate 2021 fuel-tank retaining-bolt recall also affected some cars and should be verified as done. Individual sensor fixes are cheap but the faults recur, and an unlocking car is a security risk.
Symptoms to notice
ABS or tyre pressure warning light on with no actual fault
Dash display blanking or misreading
Doors refusing to lock or unlocking themselves
Warning lights that come and go with weather
What to check
Turn the ignition on and confirm all warning lights extinguish after a few seconds and stay off for the whole test drive. Lock the car with the fob, wait a minute, and physically pull each door handle to confirm it stayed locked. Ask the seller to show the recall status for the VIN.
Where to look: Wheel speed sensors at each hub; door lock actuators; dash cluster
Ask the seller
“Do any warning lights ever appear and then disappear?”
“Have wheel speed sensors or door lock actuators been replaced?”
“Was the 2021 fuel tank bolt completed if applicable?”
EngineMajor
TransmissionMajor
EngineMajor
ElectricalMinor
4 more documented faults on the MG MG3
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 6 documented faults for the MG MG3, the recurring problem areas are interior, engine, and transmission. A MG MG3 with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used MG MG3?
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We've catalogued 6 known faults for the MG MG3, covering interior, engine, and transmission. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a MG MG3?
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Most single repairs on the MG MG3 fall between $0–$400 at NZ independent-workshop rates. Some of the 6 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a MG MG3?
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Yes. A MG MG3 inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.