The most reliable cars of 2011

Every 2011 car tested in Britain in one year, ranked by how often it failed. Measured, not surveyed.

Best

#	Car	Engine	Failure rate	Tests
1	Porsche 911	3.8 Petrol	5%	889
2	Bentley Continental	6.0 Petrol	7%	605
3	BMW M3	4.0 Petrol	9%	664
4	BMW 1 Series	3.0 Petrol	10%	611
5	Lexus CT	1.8 Petrol	11%	586
6	Audi A8	3.0 Diesel	11%	668
7	Jaguar XK	5.0 Petrol	12%	554
8	Honda Jazz	1.3 Hybrid	12%	808
9	Honda FIT	1.3 Hybrid	12%	505
10	Lexus IS250	2.5 Petrol	12%	830
11	Peugeot Boxer	2.2 Diesel	13%	2,295
12	Fiat Ducato	2.3 Diesel	13%	2,135
13	Fiat Ducato	3.0 Diesel	13%	800
14	Lexus CT	1.8 Hybrid	13%	2,220
15	Porsche Cayenne	3.0 Diesel	13%	1,080
16	Audi Q7	3.0 Diesel	14%	1,972
17	Jaguar XKR	5.0 Petrol	14%	758
18	Volkswagen Touran	1.4 Petrol	14%	739
19	Lexus CT	1.8	14%	814
20	Honda Jazz	1.3 Petrol	14%	17,859
21	Toyota IQ	1.0 Petrol	14%	2,479
22	Mini ONE	1.6 Petrol	14%	917
23	Lexus CT	1.8 Electric	14%	581
24	Fiat Ducato	2.2 Diesel	14%	727
25	Lexus RX450H	3.5 Hybrid	14%	1,901

Worst

#	Car	Engine	Failure rate	Tests
1	Renault Kangoo	1.5 Diesel	33%	6,822
2	Vauxhall Vivaro	1.9 Diesel	33%	2,877
3	Nissan Primastar	2.0 Diesel	33%	1,422
4	Renault Trafic	2.0 Diesel	33%	9,273
5	Vauxhall Vivaro	2.0 Diesel	33%	12,930
6	Nissan Qashqai	1.5 Diesel	32%	21,324
7	Renault Clio	1.5 Diesel	32%	4,236
8	Renault Megane	1.9 Diesel	32%	2,029
9	Renault Grand Scenic	1.9 Diesel	32%	511
10	Renault Clio	1.1 Petrol	31%	19,524
11	Renault Grand Scenic	1.6 Petrol	31%	1,008
12	KIA RIO	1.5 Diesel	31%	1,735
13	Nissan Qashqai	2.0 Diesel	31%	6,078
14	Nissan Juke	1.5 Diesel	31%	6,461
15	Renault Megane	1.6 Petrol	31%	7,603
16	Nissan Qashqai	1.6 Diesel	31%	930
17	Ford Transit	2.2 Diesel	31%	25,883
18	Renault Megane	1.5 Diesel	31%	7,684
19	Chevrolet Aveo	1.2 Petrol	31%	1,308
20	Citroen Grand C4 Picasso	1.6 Diesel	30%	1,536
21	Renault Grand Scenic	1.5 Diesel	30%	4,010
22	Citroen DS3	1.6 Diesel	30%	7,650
23	Chevrolet Captiva	2.0 Diesel	30%	1,452
24	KIA Venga	1.4 Diesel	30%	2,226
25	Citroen C3	1.4 Diesel	30%	3,193

What this measures

Britain tests every car over three years old against a published standard and publishes the result. This is that record for the 2011 model year, so every car here is the same age and none is flattered by being newer.

A car driven less fails less. An expensive one often sits high for reasons that are not about how well it was built, which is why the app can rank these at the same odometer reading.