The most reliable cars of 2015

Every 2015 car tested in Britain in one year, ranked by how often it failed. Measured, not surveyed.

Best

#	Car	Engine	Failure rate	Tests
1	Bentley Continental	4.0 Petrol	4%	510
2	Porsche 911	3.8 Petrol	4%	1,353
3	Porsche Boxster	2.7 Petrol	5%	628
4	Mazda MX-5	1.5 Petrol	6%	993
5	Fiat Auto Trail	2.3 Diesel	6%	1,108
6	Audi A6	4.0 Petrol	6%	727
7	Lexus NX	2.5 Hybrid	7%	3,173
8	Audi A8	3.0 Diesel	7%	770
9	Lexus RX	3.5 Hybrid	8%	1,368
10	Jaguar F-Type	3.0 Petrol	8%	1,675
11	Lexus IS	2.5 Hybrid	8%	2,924
12	Mercedes-Benz GLE-Class	3.0 Diesel	8%	621
13	Honda Jazz	1.3 Petrol	8%	17,901
14	Toyota Prius	1.8 Hybrid	8%	14,147
15	Lexus CT	1.8 Hybrid	8%	3,823
16	Honda Civic	2.0 Petrol	8%	616
17	Skoda Octavia	2.0 Petrol	9%	797
18	Mazda MX-5	2.0 Petrol	9%	1,405
19	Mercedes-Benz C-Class	4.0 Petrol	9%	597
20	Honda CR-V	2.0 Petrol	9%	5,292
21	Mini Paceman	1.6 Petrol	9%	1,355
22	Honda HR-V	1.5 Petrol	9%	1,297
23	BMW I8	1.5 Hybrid	9%	722
24	Audi A3	2.5 Petrol	9%	742
25	Toyota Auris	1.2 Petrol	9%	1,559

Worst

#	Car	Engine	Failure rate	Tests
1	Citroen Dispatch	2.0 Diesel	28%	2,347
2	Renault Clio	1.1 Petrol	28%	8,676
3	Dacia Sandero	1.5 Diesel	28%	6,541
4	Citroen DS3	1.6 Diesel	28%	5,521
5	Renault Clio	1.5 Diesel	27%	13,564
6	Renault Kangoo	1.5 Diesel	27%	5,488
7	DS DS3	1.6 Diesel	27%	3,906
8	Citroen Nemo	1.2 Diesel	27%	2,428
9	Renault Trafic	1.6 Diesel	27%	14,631
10	Nissan NV200	1.5 Diesel	26%	4,818
11	Fiat Doblo	1.2 Diesel	26%	3,759
12	Toyota Proace	2.0 Diesel	26%	1,073
13	Vauxhall Combo	1.2 Diesel	26%	5,818
14	Citroen Dispatch	1.6 Diesel	26%	3,381
15	Vauxhall Vivaro	1.6 Diesel	26%	29,729
16	Renault Megane	1.5 Diesel	26%	6,973
17	Peugeot Bipper	1.2 Diesel	26%	3,549
18	Nissan Pulsar	1.5 Diesel	26%	3,435
19	Peugeot Expert	2.0 Diesel	26%	2,092
20	Fiat Fiorino	1.2 Diesel	25%	1,059
21	Renault Clio	0.9 Petrol	25%	10,014
22	DS DS4	1.6 Diesel	25%	653
23	Citroen DS3	1.2 Petrol	25%	4,512
24	Renault ZOE	Electric	24%	2,273
25	Nissan Juke	1.5 Diesel	24%	18,207

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 2015 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.