The most reliable cars of 2014

Every 2014 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	4%	1,388
2	Toyota Prius Plus	1.8 Hybrid	5%	556
3	Porsche Boxster	3.4 Petrol	6%	537
4	Porsche Cayman	3.4 Petrol	6%	591
5	Porsche Cayman	2.7 Petrol	7%	691
6	Jaguar F-Type	3.0 Petrol	7%	1,712
7	Toyota IQ	1.0 Petrol	7%	761
8	Jaguar F-Type	5.0 Petrol	7%	514
9	Audi A8	3.0 Diesel	7%	787
10	Porsche Boxster	2.7 Petrol	8%	749
11	Lexus NX	2.5 Hybrid	8%	879
12	Lexus RX	3.5 Hybrid	8%	1,752
13	Jaguar XK	5.0 Petrol	8%	1,268
14	Audi TT	1.8 Petrol	9%	1,426
15	Lexus CT	1.8 Hybrid	9%	4,142
16	Lexus IS	2.5 Hybrid	9%	3,194
17	Fiat Auto Trail	2.3 Diesel	9%	616
18	Toyota Prius	1.8 Hybrid	9%	12,255
19	Honda Jazz	1.3 Petrol	10%	17,716
20	Audi Q5	3.0 Diesel	10%	2,344
21	BMW M4	3.0 Petrol	10%	1,068
22	Mercedes-Benz GLA-Class	2.0 Petrol	10%	588
23	Toyota RAV-4	2.2 Diesel	10%	598
24	Mini ONE	1.2 Petrol	10%	3,875
25	Porsche Panamera	3.0 Diesel	10%	536

Worst

#	Car	Engine	Failure rate	Tests
1	Renault G	1.5 Diesel	30%	890
2	Renault Clio	1.1 Petrol	30%	11,300
3	Renault Megane	1.5 Diesel	30%	7,974
4	Vauxhall Vivaro	2.0 Diesel	29%	10,859
5	Nissan Primastar	2.0 Diesel	29%	616
6	Renault Trafic	2.0 Diesel	29%	6,753
7	Dacia Sandero	1.5 Diesel	29%	6,744
8	Citroen DS3	1.6 Diesel	29%	12,396
9	Renault Clio	1.5 Diesel	29%	13,642
10	Renault Kangoo	1.5 Diesel	28%	4,461
11	Renault Trafic	1.6 Diesel	28%	2,871
12	Nissan NV200	1.5 Diesel	28%	3,747
13	Toyota Proace	2.0 Diesel	28%	723
14	Vauxhall Vivaro	1.6 Diesel	28%	6,963
15	Citroen DS3	1.2 Petrol	28%	2,373
16	Citroen Dispatch	2.0 Diesel	28%	1,848
17	Citroen Dispatch	1.6 Diesel	27%	2,805
18	Peugeot Expert	2.0 Diesel	27%	1,811
19	Ford Fiesta	1.5 Diesel	27%	11,770
20	Mercedes-Benz Citan	1.5 Diesel	27%	2,920
21	Nissan Juke	1.5 Diesel	27%	20,947
22	Renault Megane	1.6 Petrol	27%	880
23	Peugeot Bipper	1.2 Diesel	27%	3,086
24	Peugeot 5008	1.6 Diesel	27%	1,761
25	Citroen Nemo	1.2 Diesel	27%	2,285

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 2014 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.