Germany marque
Porsche in the UK
Porsche Cars Great Britain was set up in the 1960s and Britain is now one of its largest markets outside Germany and China. The Cayenne and Macan account for most of its volume here, not the 911, and that is what fills its used forecourts. Bore scoring on the early water cooled flat six engines and coolant pipe failures on the first generation Cayenne are the two faults worth a specialist inspection.
There is no reliability figure for Porsche as a marque that this site could cite. What circulates instead is survey data from panels that select themselves, warranty claim rates published by companies with a product to sell, and averages built by choosing which years and variants to count.
Each of those choices moves the answer by several percentage points, and none of them is a measurement a reader could go and check. A number printed beside the Porsche badge here would be our arithmetic wearing somebody else's name.
What is genuinely knowable is one car at a time: its own invoices, its own service record and what the common repairs on that model actually cost when they arrive.
No fault ordering is published for this marque
Model by model
Every Porsche line we hold a record for
| Model | Years sold in the UK | Body styles | Fuel types | Fuel options |
|---|---|---|---|---|
| 911 | since 1964 | Coupé, Convertible | Petrol, Plug-in hybrid | 2 |
| Cayenne | since 2002 | SUV | Petrol, Diesel, Plug-in hybrid | 3 |
| Macan | since 2014 | SUV | Petrol, Diesel, Electric | 3 |
| Boxster | since 1996 | Convertible | Petrol | 1 |
| Cayman | since 2005 | Coupé | Petrol | 1 |
| Panamera | since 2009 | Hatchback | Petrol, Diesel, Plug-in hybrid | 3 |
Before you buy one
What the Porsche record does and does not settle
There are 6 Porsche model lines here and the oldest of them went on sale in Britain in 1964. Of those, 6 are still sold new and none have finished. A finished line is not automatically a worse buy, but it fixes the newest example you will ever find and it decides how long the parts supply has had to run.
Between them those models have been sold here with 4 different fuel types: petrol, plug-in hybrid, diesel and electric. That spread is the practical reason one figure for the whole marque would be no use to anybody standing on a forecourt. Electric cars lost their road tax exemption on 1 April 2025, so an electric one now pays the same standard rate as a petrol one of the same age. The alternative fuel discount that used to shave a little off hybrids ended on the same date, so hybrid badging no longer changes the bill. Diesels carry a particulate filter, and a car used only for short cold journeys will keep blocking it until the driving pattern changes.
Those lines were bodied 4 ways: coupé, convertible, SUV and hatchback. On the convertibles, look at the roof drainage channels: blocked ones put rainwater into the footwell instead of out through the sill. The four wheel drive versions carry more driveline than the two wheel drive ones, and driveshaft boots and propshaft joints are all inspected.
Because the oldest line here reaches back to 1964, examples across this marque fall under all three road tax regimes: engine size for anything first registered before 1 March 2001, CO2 bands from then until 31 March 2017, and the flat standard rate for anything registered on or after 1 April 2017. That is why the tax figure on each model page names the year and the engine it applies to, and why it is safer to read the V5C than to take a rate from a badge.
What goes wrong on a Porsche is decided by the individual car and the person who owned it last, not by the marque. Two examples of the same model and year, one serviced on time and one not, are in completely different condition, which is the honest reason a marque average would mislead you even if somebody published one. The invoices for the car in front of you name what was actually replaced, when, and at what mileage. Read those instead.