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Porsche reliability and common MOT problems by model

Porsche shows a 10.4% combined MOT failure rate across 175,658 tests in Motintel data. Macan has one of the lower high-confidence rates at 6.3%. Boxster deserves extra checking at 13.8%.

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 Porsche models in MOT data

#	Model	MOT failure rate	Tests	Vehicles
1	Porsche Macan	6.3%	28,509 tests	25,528 vehicles
2	Porsche 911	9.5%	52,087 tests	46,003 vehicles
3	Porsche Cayenne	11.7%	31,671 tests	26,805 vehicles
4	Porsche Boxster	13.8%	37,183 tests	31,551 vehicles

Porsche models with the highest MOT failure rates

#	Model	MOT failure rate	Tests	Vehicles
1	Porsche Boxster	13.8%	37,183 tests	31,551 vehicles
2	Porsche Cayenne	11.7%	31,671 tests	26,805 vehicles
3	Porsche 911	9.5%	52,087 tests	46,003 vehicles
4	Porsche Macan	6.3%	28,509 tests	25,528 vehicles

Common Porsche MOT problem areas

#	Problem area	MOT notes	Models affected	What to check	High-rate examples
1	Corrosion and structure	23,792 MOT notes	4 models	Inspect sills, subframes, suspension mounts, brake pipes, and previous welding or rust repairs.	Porsche Boxster, Porsche 911, Porsche Cayenne
2	Emissions, engine, and exhaust	9,525 MOT notes	4 models	Check cold starts, exhaust smoke, warning lights, service history, and recent emissions repairs.	Porsche Boxster, Porsche 911, Porsche Cayenne
3	Suspension and steering	8,670 MOT notes	4 models	Listen for knocks, check uneven tyre wear, and ask whether worn joints or bushes have been replaced.	Porsche Boxster, Porsche 911, Porsche Cayenne
4	Lights and electrical	7,800 MOT notes	4 models	Test every exterior light, warning lamp, horn, washer, and basic electrical function before buying.	Porsche Cayenne, Porsche Boxster, Porsche 911
5	Windscreen, wipers, and mirrors	5,514 MOT notes	4 models	Check the windscreen, wipers, washers, mirrors, chips, cracks, and whether the driver's view is clear.	Porsche Cayenne, Porsche Boxster, Porsche 911
6	Tyres and wheels	2,761 MOT notes	4 models	Look for matching tyres, legal tread, sidewall damage, wheel damage, and uneven wear.	Porsche Cayenne, Porsche Macan, Porsche 911

All Porsche model reports

Model	MOT tests	Vehicles	Failure rate
911	52,087	46,003	9.5%
Boxster	37,183	31,551	13.8%
Cayenne	31,671	26,805	11.7%
Macan	28,509	25,528	6.3%
Cayman limited data	14,865	12,995	8.8%
Panamera limited data	7,151	6,147	10.2%
944 limited data	2,791	2,258	18.7%
Taycan 4s 93kwh limited data	1,401	1,212	9.1%

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.