Mg 3
Reliability, running costs, and MOT data across 10 years from 31,882 real MOT tests.
Avg Pass Rate
85%
Total Tests
31,882
Best Year
2021 (92%)
Years Covered
10
How reliable is the Mg 3?
Mg 3 by Year
Checking a specific Mg 3?
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About the Mg 3
The Mg 3 has been tested 31,882 times in 2024 MOT data across 10 model years (2013 to 2022), with an average pass rate of 85%. That's slightly above the national average of 82%. Available as petrol.
Best and Worst Years
The 2021 model is the most reliable with a 92% pass rate from 1,100 tests. The 2015 model has the lowest at 79%. The 13 point spread between years means reliability varies somewhat, but no year is dramatically different.
Reliability Trend
Newer MG 3s show better MOT pass rates than older ones, with an average improvement of 8 percentage points.
Mileage Across Years
The oldest model in our data (2013) averages 60,551 miles, while the newest (2022) averages 19,942 miles.
Click any year in the table above to see detailed running costs, individual reliability data, and comparisons with similar cars.