MG Reliability UK 2026

How reliable is a MG? Here’s a data-led reliability profile based on first-time MOT pass rates, model-level breakdown, top failure categories, and a buyer’s verdict.

By Bertram Sargla, Founder, MOT CheckupLast updated: 2026-05-16Data sourced from DVSA

MG reliability snapshot: first-time MOT pass rate 84.4% (+20.4 pp vs the UK average of 64%). Across 7 MG models, the typical dangerous-defect rate is 1.31% and the average retest rate is 10.8%. MG sits well above the UK average on first-time MOT performance. For a buyer focused on long-term reliability, it's a solid badge — though individual mileage and service history still matter more than brand.

MG first-time MOT pass rate

84.4%

Implied failure rate: 15.6% · UK average pass rate: 64%

vs UK average

+20.4 pp

Dangerous defects

1.31%

Retest rate

10.8%

How MG compares to the UK average

The UK national first-time MOT pass rate is 64%, with about 36% of cars failing on the first attempt.MG’s pass rate of 84.4% is 20.4 percentage points above that benchmark. That ’s a brand-average figure — individual MG models range from the high 60s to above 90%, so model and age matter more than the badge.

MG pass rate84.4%

UK average pass rate64%

Most reliable MG models

Ranked by first-time MOT pass rate across our reliability dataset. Restricted to models with meaningful sample size.

MG MG4

2022–present · sample ≈8k

90.5%

MG MG5 EV

2022–present · sample ≈5k

89.2%

MG ZS EV

2019–present · sample ≈10k

88.5%

Most problematic MG models

The MG models in our dataset with the lowest first-time MOT pass rates. A low pass rate doesn’t mean a bad car — older platforms naturally accumulate wear faster — but it does mean a pre-purchase MOT history check is essential.

MG 3

2018–present · sample ≈8k

80.2%

MG ZS

2017–present · sample ≈22k

81.5%

MG HS

2019–present · sample ≈12k

82.8%

Run a free MOT check on a specific MG

Brand averages set expectations — a single car’s history is what actually decides whether it’s worth buying.

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Top MOT failure categories for MG

Aggregated across 7 MG models in our dataset, weighted by sample size.

Lamps, reflectors and electrical equipment

13.4%

Suspension

11.5%

Brakes

10.1%

Tyres

9.6%

Exhaust, fuel and emissions

5.6%

MG reliability — FAQ

Is MG a reliable car brand in the UK?

MG's first-time MOT pass rate of 84.4% is above the UK national average of 64%, putting it in the stronger half of brands for MOT reliability. We track 7 MG models in our dataset.

What is the most reliable MG model for MOT?

Based on first-time MOT pass rates, the most reliable MG models in our dataset are: MG MG4 (90.5%), MG MG5 EV (89.2%), MG ZS EV (88.5%). Newer EV variants tend to score highest because they avoid emissions-related failures entirely.

Which MG models fail their MOT most often?

In our dataset, the MG models with the lowest first-time MOT pass rates are: MG 3 (80.2%), MG ZS (81.5%), MG HS (82.8%). These tend to be older or higher-mileage models; the same name in a newer year often performs noticeably better.

What are the most common MOT failures on a MG?

Aggregated across MG models, the most common MOT failure categories are: lamps, reflectors and electrical equipment (13.4%), suspension (11.5%), brakes (10.1%). These align with the national pattern; lighting, suspension, and tyre defects dominate UK MOT failures across most brands.

Check a MG’s MOT history

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Source: MOT Checkup analysis of DVSA MOT test data. Brand-average pass rate is sample-size weighted across 7 MG models in our dataset. Individual cars vary considerably — always check the specific registration’s MOT history before buying.