What year Porsche 911 is most reliable?

Based on MOT first-test pass rates, the 2020 Porsche 911 has the highest pass rate at 96.9%, out of 869 vehicles tested.

What are the most common Porsche 911 MOT failures?

The most common Porsche 911 MOT failures vary by year. Check the individual year pages for detailed defect breakdowns — links in the table above.

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Porsche 911 — Reliability by Year

67,627 vehicles · MOT data 1980–2020 · first-test pass rates

This page shows MOT first-test pass rates for each year the Porsche 911 was manufactured — click any year to explore that cohort in detail. Trying to decide which year to buy? See the full buying guide →

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Best pass rate year

2020

96.9% pass rate · 869 vehicles

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Lowest pass rate year

1980

76.5% pass rate · 649 vehicles

Year	Pass rate	Avg mileage	Vehicles
2020	96.9%	14,813 mi	869
2019	96.0%	16,017 mi	2,519
2018	95.2%	13,678 mi	2,341
2017	95.7%	18,543 mi	2,061
2016	95.5%	20,556 mi	1,935
2015	95.4%	22,871 mi	1,878
2014	94.8%	24,086 mi	1,713
2013	94.6%	30,276 mi	1,370
2012	93.3%	33,674 mi	1,606
2011	92.4%	30,892 mi	1,302
2010	91.3%	34,081 mi	1,880
2009	90.3%	41,218 mi	1,622
2008	89.6%	39,141 mi	2,249
2007	89.2%	40,381 mi	3,177
2006	87.2%	45,746 mi	3,673
2005	87.2%	48,982 mi	3,768
2004	85.4%	50,929 mi	3,314
2003	84.3%	55,213 mi	3,542
2002	83.5%	60,142 mi	3,414
2001	83.0%	66,322 mi	2,269
2000	82.4%	69,361 mi	1,509
1999	81.1%	75,420 mi	2,038
1998	81.6%	79,687 mi	1,811
1997	85.3%	65,912 mi	1,253
1996	86.0%	72,038 mi	1,572
1995	85.3%	74,557 mi	1,148
1994	84.8%	85,713 mi	984
1993	84.1%	83,032 mi	600
1992	84.6%	84,313 mi	588
1991	83.3%	91,259 mi	818
1990	82.4%	98,917 mi	1,504
1989	83.3%	80,944 mi	1,129
1988	82.4%	90,593 mi	755
1987	80.7%	95,950 mi	858
1986	79.3%	97,176 mi	899
1985	77.8%	99,769 mi	607
1984	78.5%	98,299 mi	534
1983	78.1%	102,310 mi	552
1982	78.4%	108,420 mi	687
1981	76.9%	102,114 mi	630
1980	76.5%	101,058 mi	649

Which year Porsche 911 is most reliable?

MOT pass rate by year of manufacture — averaged across each vehicle's lifetime of tests. Green = noticeably above average for this model; red = noticeably below average.

Tests range from an average of 13,678 miles (newest year) to 108,420 miles (oldest year). Older years naturally accumulate more tests at higher mileages — see the mileage-normalised breakdown →

Trying to decide which year to buy?

We've done the full analysis — which years to look for, which to avoid, and where to find the best value for reliability on a Porsche 911.

See the buying guide →

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