Is the Porsche 911 reliable?

The Porsche 911 has an average MOT pass rate of 92% across 32 years, based on 117,064 tests in 2026. That's 10 points above the national average of 82%. The most reliable year is 2021 with a 100% pass rate.

Which year Porsche 911 is best?

The 2021 Porsche 911 has the highest MOT pass rate at 100%, while the 1998 model has the lowest at 85%. There's a 15 percentage point spread between the best and worst years.

Porsche 911

Reliability, running costs, and MOT data across 32 years from 117,064 real MOT tests.

Avg Pass Rate

92%

Total Tests

117,064

Best Year

2021 (100%)

Years Covered

About the Porsche 911

The Porsche 911 has been tested 117,064 times in 2026 MOT data across 32 model years (1990 to 2021), with an average pass rate of 92%. That's comfortably above the national average of 82%, making it a reliable choice. Available as petrol and LP.

Best and Worst Years

The 2021 model is the most reliable with a 100% pass rate from 72 tests. The 1998 model has the lowest at 85%. The 15 point spread between years means reliability varies somewhat, but no year is dramatically different.

Reliability Trend

Newer PORSCHE 911s show better MOT pass rates than older ones, with an average improvement of 6 percentage points.

Mileage Across Years

The oldest model in our data (1990) averages 94,950 miles, while the newest (2021) averages 11,708 miles.

Estimated Running Costs

Fuel (Petrol, 2981cc)

£1,592

Road Tax

£195

MOT Test

£55

Predicted Repairs

£200

Total per year£2,042

Per month£170/mo

Based on 7,400 miles/year, current fuel prices, and MOT pass rate data. Insurance not included.

Full 2021 details

How reliable is the Porsche 911?

vs national average+10% (82% avg)

vs Porsche brand average+0% (92% avg)

Best to worst year spread15 percentage points

Reliability trendImproving over years

Porsche 911 by Year

Click any year to see detailed running costs, reliability data, and comparisons with similar cars.

Year	Pass Rate	Tests	Avg Mileage
2021	100%	72	11,708 mi
2020	97%	2,366	17,049 mi
2019	97%	7,188	20,907 mi
2018	96%	7,623	18,989 mi
2017	97%	6,200	26,067 mi
2016	97%	5,524	28,111 mi
2015	97%	4,950	32,698 mi
2014	96%	4,806	32,843 mi
2013	96%	3,535	43,937 mi
2012	95%	4,253	50,959 mi
2011	95%	2,580	43,837 mi
2010	94%	3,656	49,709 mi
2009	92%	3,055	59,885 mi
2008	92%	4,216	58,132 mi
2007	90%	5,366	62,566 mi
2006	90%	6,184	70,206 mi
2005	90%	5,986	73,824 mi
2004	88%	5,191	74,425 mi
2003	87%	5,168	82,296 mi
2002	86%	4,972	84,310 mi
2001	88%	2,885	87,628 mi
2000	86%	2,099	90,453 mi
1999	87%	3,668	94,086 mi
1998	85%	3,337	99,008 mi
1997	90%	2,103	76,331 mi
1996	91%	2,651	80,487 mi
1995	89%	1,831	80,965 mi
1994	91%	1,473	95,559 mi
1993	91%	698	89,736 mi
1992	94%	611	81,375 mi
1991	91%	929	81,480 mi
1990	91%	1,888	94,950 mi