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MG reliability and common MOT problems by model

MG shows a 16.3% combined MOT failure rate across 93,457 tests in Motintel data. Zs has one of the lower high-confidence rates at 13.6%. Zs deserves extra checking at 13.6%.

Data sources: DVSA MOT records, official recall records, and MOT fault wording snapshots (2026-04-27, 2026-04-29, rfr_codes_2025-05-12, failure items 2023). Search-indexed model pages must clear 20,000 MOT tests and 10,000 vehicles.

Most reliable MG models in MOT data

#	Model	MOT failure rate	Tests	Vehicles
1	MG Zs	13.6%	22,047 tests	18,382 vehicles

MG models with the highest MOT failure rates

#	Model	MOT failure rate	Tests	Vehicles
1	MG Zs	13.6%	22,047 tests	18,382 vehicles

Common MG MOT problem areas

#	Problem area	MOT notes	Models affected	What to check	High-rate examples
1	Corrosion and structure	2,050 MOT notes	1 models	Inspect sills, subframes, suspension mounts, brake pipes, and previous welding or rust repairs.	MG Zs
2	Windscreen, wipers, and mirrors	888 MOT notes	1 models	Check the windscreen, wipers, washers, mirrors, chips, cracks, and whether the driver's view is clear.	MG Zs
3	Lights and electrical	858 MOT notes	1 models	Test every exterior light, warning lamp, horn, washer, and basic electrical function before buying.	MG Zs
4	Emissions, engine, and exhaust	794 MOT notes	1 models	Check cold starts, exhaust smoke, warning lights, service history, and recent emissions repairs.	MG Zs
5	Suspension and steering	715 MOT notes	1 models	Listen for knocks, check uneven tyre wear, and ask whether worn joints or bushes have been replaced.	MG Zs
6	Tyres and wheels	694 MOT notes	1 models	Look for matching tyres, legal tread, sidewall damage, wheel damage, and uneven wear.	MG Zs

All MG model reports

Model	MOT tests	Vehicles	Failure rate
Zs	22,047	18,382	13.6%
3 limited data	21,084	17,445	14.8%
Tf limited data	12,139	9,524	21.6%
Mgf limited data	7,870	5,985	24.8%
Zs Exclusive Ev limited data	5,920	5,189	6.8%
Gs limited data	3,258	2,714	13.0%
B limited data	3,145	2,652	16.2%
Zr limited data	2,981	2,261	25.0%
6 limited data	2,760	1,980	27.0%
Zt limited data	2,122	1,582	25.7%
5 Exclusive limited data	2,001	1,273	5.1%
B Gt limited data	1,625	1,358	16.7%
5 Excite limited data	1,407	735	7.3%
Zs Exclusive Vti Tech limited data	1,317	1,186	8.6%
Hs Exclusive S A limited data	1,310	1,155	6.6%
Zt T limited data	1,248	906	28.4%
Hs Exclusive limited data	1,223	1,081	7.3%

Models with limited data (fewer than 20,000 tests or 10,000 vehicles) have full reports but are not indexed in search engines until the evidence threshold is met.