MG model reference
MG MG3
What our record holds on the MG3, sold in the UK 2013 to 2019, then again since 2024: body styles, fuel types and the road tax a used one pays.
No reliability figure is published for the MG MG3 that this site could cite. What circulates instead is survey data from panels that select themselves, and warranty claim rates published by companies with something to sell.
Any percentage would be our own calculation. Which years count, and whether a facelift and a new generation sharing the MG3 name are one model or two, both move the answer, and neither choice is anybody official's.
So the field does not exist. We do not average the other MG models into a number and put it here, and we do not push a marque figure down onto the MG3. What is real and specific is the paperwork for one car.
No fault ordering is published for the MG3
A 2015 1.5 VTi-Tech at about 136 g/km is band E, £200 for twelve months in 2026/27.
That figure is a worked example for the year and engine named, not a rate for every MG3. Read the CO2 figure and the first registration date off the V5C before you budget, because both change the answer.
See every band for this tax yearStanding next to one
Buying a used MG3: what the record settles
Our record puts the MG3's UK sales period at 2013 to 2019, then again since 2024. That range is the useful starting point, because everything about the cost of running one turns on where a particular example sits inside it. It came in one body style here, hatchback, with 2 fuel types: petrol and petrol hybrid.
The MG3 was on sale on both sides of the road tax change of 1 April 2017, and that is the single most useful thing to know before you buy one. An example first registered up to 31 March 2017 is taxed on its CO2 figure under the lettered bands, so engine, gearbox and even wheel size can move two cars of the same year into different bands. One registered from 1 April 2017 pays the flat standard rate instead and its CO2 stops mattering. Two otherwise identical cars a year apart can cost noticeably different amounts to keep taxed, and only the V5C tells you which one you are looking at.
For running costs the fuel matters more than the badge.
None of that is a substitute for the record of the actual car. The invoices name what was replaced, when and at what mileage, and the same job appearing twice in three years says more about a MG3 than any statistic about the model ever could. A mileage that goes backwards across a paperwork trail is worth walking away from whatever the badge is.
MG has carried a British badge since 1924 and has been owned by SAIC of China since 2007, selling Chinese built cars here since 2011. It has grown into one of the ten largest marques by UK registrations, and the HS was in the new car top ten in 2025 and again in 2026. Its seven year warranty and low prices are the draw, and its older ZS and MG3 models are now reaching the age where used buyers meet them. That is context on the marque rather than on this car, and there is more of it, along with every other model line, on the MG page.