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
About the Mg 3
The Mg 3 has been tested 31,882 times in 2026 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.
Estimated Running Costs
Based on 7,400 miles/year, current fuel prices, and MOT pass rate data. Insurance not included.
Full 2022 detailsHow reliable is the Mg 3?
Mg 3 by Year
Click any year to see detailed running costs, reliability data, and comparisons with similar cars.
Mg 3 Guides & Articles
Cheapest Cars to Run in 2026: Real Data from 19.8 Million MOT Tests
9 min read
Reliability20 Most Reliable Used Cars UK 2026: Real MOT Pass Rate Rankings
10 min read
ReliabilityMost Reliable Used Cars UK 2026 (Data From 50M Real MOT Tests)
11 min read
Buying GuideFord Fiesta Common Problems (2026): What to Check Before Buying
13 min read
ReliabilityFord Puma Problems: 7 Issues Owners Report (2026)
13 min read
Checking a specific Mg 3?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.