The most reliable cars of 2009

Every 2009 car tested in Britain in one year, ranked by how often it failed. Measured, not surveyed.

Best

#	Car	Engine	Failure rate	Tests
1	Nissan GT-R	3.8 Petrol	5%	661
2	Porsche 911	3.8 Petrol	9%	838
3	Porsche 911	3.6 Petrol	9%	642
4	Toyota Estima	2.4 Hybrid	9%	756
5	BMW M3	4.0 Petrol	10%	779
6	BMW Z4	3.0 Petrol	13%	1,047
7	Fiat Ducato	3.0 Diesel	13%	1,051
8	Toyota IQ	1.3 Petrol	15%	731
9	Fiat Ducato	2.3 Diesel	15%	2,337
10	Lexus RX400H	3.3 Hybrid	15%	1,198
11	BMW Z4	2.5 Petrol	15%	1,586
12	BMW 1 Series	3.0 Petrol	15%	663
13	BMW 7 Series	3.0 Diesel	15%	545
14	Ford Focus	2.5 Petrol	15%	2,970
15	Toyota Estima	2.4 Petrol	16%	690
16	Toyota Avensis	2.0 Petrol	16%	554
17	Fiat Ducato	2.2 Diesel	16%	773
18	Audi Q5	2.0 Petrol	16%	520
19	Jaguar XJ	2.7 Diesel	16%	517
20	Toyota IQ	1.0 Petrol	16%	6,725
21	Lexus IS250	2.5 Petrol	17%	1,384
22	Lexus RX450H	3.5 Hybrid	17%	1,330
23	BMW X6	3.0 Diesel	17%	1,074
24	Peugeot Boxer	2.2 Diesel	17%	2,069
25	Mazda MX-5	2.0 Petrol	17%	2,851

Worst

#	Car	Engine	Failure rate	Tests
1	Nissan Qashqai	1.5 Diesel	36%	13,417
2	Nissan Qashqai	2.0 Diesel	35%	2,436
3	Renault Clio	1.5 Diesel	34%	4,729
4	Nissan Qashqai	1.6 Petrol	34%	12,651
5	Vauxhall Vivaro	1.9 Diesel	33%	525
6	Nissan Pathfinder	2.5 Diesel	33%	1,046
7	Vauxhall Vivaro	2.0 Diesel	33%	5,701
8	Renault Kangoo	1.5 Diesel	33%	2,040
9	Chevrolet Aveo	1.2 Petrol	33%	3,328
10	Renault Megane	1.5 Diesel	32%	5,048
11	Chevrolet Aveo	1.4 Petrol	32%	1,342
12	Mazda 5	2.0 Petrol	32%	856
13	Nissan Primastar	2.0 Diesel	32%	1,165
14	Isuzu Rodeo	2.5 Diesel	32%	516
15	Peugeot 3008	1.6 Diesel	32%	643
16	Chevrolet Captiva	2.0 Diesel	32%	1,061
17	Mercedes-Benz CLC-Class	2.1 Diesel	32%	1,843
18	Renault Megane	1.9 Diesel	32%	818
19	Alfa Romeo 159	1.9 Diesel	32%	828
20	Citroen Grand C4 Picasso	1.6 Diesel	32%	1,748
21	Suzuki Swift	1.2 Diesel	31%	604
22	Renault Megane	1.6 Petrol	31%	7,352
23	Renault Trafic	2.0 Diesel	31%	4,428
24	Ford Transit	2.2 Diesel	31%	14,731
25	Renault Clio	1.1 Petrol	31%	19,147

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 2009 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.