The most reliable cars of 2012

Every 2012 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	7%	1,234
2	Honda FIT	1.3 Hybrid	7%	584
3	Bentley Continental	6.0 Petrol	7%	554
4	Porsche Boxster	3.4 Petrol	8%	610
5	BMW M3	4.0 Petrol	8%	577
6	Toyota Estima	2.4 Hybrid	8%	631
7	Audi A8	3.0 Diesel	9%	689
8	Lexus RX	3.5 Hybrid	9%	737
9	Honda Jazz	1.3 Hybrid	9%	903
10	Lexus RX450H	3.5 Hybrid	11%	1,166
11	Porsche Boxster	2.7 Petrol	11%	570
12	Jaguar XK	5.0 Petrol	11%	576
13	Toyota Verso	1.3 Petrol	11%	633
14	Lexus CT	1.8 Hybrid	12%	3,163
15	Toyota IQ	1.0 Petrol	12%	2,292
16	Volkswagen Touran	1.4 Petrol	12%	517
17	Lexus CT	1.8	12%	697
18	Fiat Ducato	2.3 Diesel	12%	2,341
19	Audi TT	2.0 Petrol	12%	2,445
20	Porsche Panamera	3.0 Diesel	13%	536
21	Audi A7	3.0 Diesel	13%	1,448
22	Mazda MX-5	2.0 Petrol	13%	2,006
23	Audi TT	1.8 Petrol	13%	1,673
24	Honda Jazz	1.3 Petrol	13%	20,093
25	Toyota Prius	1.8 Hybrid	13%	8,540

Worst

#	Car	Engine	Failure rate	Tests
1	Chevrolet Aveo	1.2 Diesel	32%	587
2	Renault Clio	1.5 Diesel	32%	4,418
3	Nissan Primastar	2.0 Diesel	32%	724
4	Vauxhall Vivaro	2.0 Diesel	32%	11,301
5	Renault Kangoo	1.5 Diesel	32%	3,993
6	Nissan Qashqai	1.5 Diesel	31%	23,227
7	Renault Clio	1.1 Petrol	31%	16,040
8	Citroen DS3	1.6 Diesel	31%	10,823
9	Renault Grand Scenic	1.6 Diesel	30%	506
10	Vauxhall Vivaro	1.9 Diesel	30%	1,489
11	Renault Trafic	2.0 Diesel	30%	6,390
12	Renault Megane	1.6 Petrol	30%	3,016
13	Nissan Juke	1.5 Diesel	30%	12,348
14	Renault Grand Scenic	1.5 Diesel	30%	1,499
15	Vauxhall Combo	1.2 Diesel	30%	3,634
16	Nissan Qashqai	1.6 Diesel	29%	9,014
17	Renault Megane	1.6 Diesel	29%	666
18	KIA RIO	1.1 Diesel	29%	2,057
19	Renault Megane	1.5 Diesel	29%	7,537
20	SsangYong Korando	2.0 Diesel	29%	685
21	Ford Transit	2.2 Diesel	29%	21,614
22	Peugeot Bipper	1.4 Diesel	29%	1,107
23	Nissan NV200	1.5 Diesel	29%	4,061
24	Citroen Dispatch	1.6 Diesel	29%	1,788
25	Nissan Pathfinder	2.5 Diesel	29%	537

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 2012 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.