The Car You're Buying Was Probably on a PCP Deal — Here's Why That Makes Mileage the Biggest Risk You're Not Checking

According to diagnostics company Carly, 16.25% of used cars checked in the UK between January and September 2025 had a mileage discrepancy. That's roughly one in seven. And the reason that number is climbing has almost nothing to do with dodgy traders in lock-up garages. It's got everything to do with how ordinary drivers finance their cars.

Here's the pipeline nobody's talking about: most new cars in the UK are bought on PCP deals with strict mileage limits. Most of those cars get returned at the end of the contract. Some of those drivers, facing bills of £1,500 or more for going over their limit, fit a device to freeze the odometer first. Then the car lands on a forecourt. Then you buy it.

Why Almost Every Used Car You View Has Been on PCP

The Finance and Leasing Association reports that over 80% of new cars are purchased using finance, and PCP accounts for around 83% of those deals. More than 2 million cars were financed at point of sale in 2024 alone.

Around 80% of PCP customers return their car at the end of the contract and roll into a new deal. They don't buy it outright. That means the vast majority of PCP cars flow directly back into the used market, often straight onto dealer forecourts.

So when you're browsing AutoTrader for a three-year-old Ford Puma or a nearly-new Volkswagen Golf, the odds are strong that whoever had it before you was making monthly payments, not owning it. And their finance agreement came with conditions.

The Mileage Penalty That Turns Ordinary Drivers Into Fraudsters

Every PCP contract includes an agreed annual mileage limit. The finance company sets this upfront because it directly affects the car's predicted value at the end of the deal. Lower mileage, higher value, lower monthly payments.

The average mileage used by manufacturers in finance advertisements is around 6,000 miles per year. The average UK driver actually covers closer to 15,000 miles a year. That gap, baked in at the point of sale, sets huge numbers of drivers up to face a bill when they hand the keys back.

Excess mileage charges typically run from 3p to 30p per mile over the limit. A driver who agreed to 5,000 miles per year on a three-year deal but covered 10,000 a year could be looking at a charge of around £1,500. Some lenders quote their pence-per-mile rate excluding VAT, which adds another 20% on top, so the real bill can be even higher than drivers expect.

That's the financial pressure sitting over the car you're about to buy.

How Clocking Actually Works Now (It's Not What You Think)

Most people picture clocking as someone manually winding back a mechanical dial. That stopped being the main method years ago. Digital odometers have actually made mileage fraud easier and harder to detect at the same time.

Mileage blockers are small electronic components, priced between £200 and £900, that plug directly into a car's CAN-bus system, the network that connects all the vehicle's electronic modules. Unlike old correction software, these devices don't wind the mileage back. They freeze it. The car keeps driving, but the odometer stops counting. Suppliers claim the devices prevent mileage data from being written to any ECU or module, including, in some cases, the ignition key.

Autocar's investigation found that hundreds of drivers and businesses are buying and fitting these devices every week, specifically to avoid excess mileage charges at the end of PCP and lease agreements. The devices are not illegal to sell. Using them on the road is.

Glass's Guide flagged this exact pipeline years ago: it is not the trade who is at fault but the consumer, and this will become a widespread problem as the volume of PCP cars returning to the market steps up. That volume has only grown since.

Because many of these cars are under three years old, there is often no MOT certificate and sometimes only a single service stamp. The paper trail that would normally expose a clocked car simply doesn't exist yet.

The financial stakes for buyers are real. Falsely lowering a car's mileage can inflate its value by as much as 25%. Reducing a displayed mileage from 120,000 to 50,000 miles can add £3,000 to £8,000 to the asking price. Traders still do it too: in January 2025, three men from Kent received suspended sentences for clocking multiple vehicles, with an average mileage reduction of more than 90,000 miles per car.

Do EV Buyers Face a Bigger Problem?

Analysis from vehicle history platform carVertical shows electric cars are now the most commonly clocked vehicle type in the UK. Among EVs checked, 3% showed evidence of mileage tampering, ahead of diesel (2.8%), petrol (2.5%) and hybrids (2%).

Some brands are worse than others. Kia EVs showed discrepancies in 13.6% of checks, Nissan in 12.4%, Renault in 4%.

For EV buyers, the problem goes beyond overpaying. Battery degradation is tied directly to charge cycles and total mileage. A car with 20,000 hidden miles has a battery that has been used significantly harder than the displayed figure suggests. You won't see it on the dashboard. You'll notice it the first winter when your range drops 30% and the resale value collapses.

An EV battery replacement can cost thousands of pounds. Buying a clocked electric car isn't just paying too much upfront, it's inheriting a cost you had no way to price in.

What a Mileage History Check Actually Shows You

The most reliable way to expose a clocked car is to compare mileage readings recorded at different points in the car's life. Every MOT test records the odometer reading, and that data is held by the DVSA. Service stamps, previous keeper changes, and finance records add further data points.

A mileage discrepancy shows up when the numbers don't move in a straight line. If a car was recorded at 34,000 miles at its first MOT and is now being sold with 28,000 on the clock, that's not ambiguous. If the mileage jumps implausibly between service stamps, that's a flag. If the car is too young for an MOT history but the service record has only one stamp, that's worth questioning.

A vehicle history check cross-references these records and surfaces inconsistencies before you've driven to view the car. CarSense's mileage check pulls from MOT records, previous keeper data, and finance checks in one place.

Red Flags to Look For When Viewing an Ex-PCP Car

Even before you run a check, there are physical signs worth knowing.

Wear doesn't match the mileage. Pedal rubber, the steering wheel leather, and the driver's seat bolster all accumulate wear at a fairly predictable rate. A car showing 18,000 miles with worn-through pedal rubbers and a shiny patch on the driver's seat bolster has probably done more.

The service history has gaps. A PCP car returned early, or a driver trying to reduce evidence of high use, might skip services. Missing stamps between years, or a long unexplained gap, deserve an explanation.

The car is being sold right at the end of a typical PCP term. Most PCP deals run two to four years. A three-year-old car being sold through a dealer, particularly if it was registered in 2021 or 2022, is exactly the profile of a PCP return.

The price is suspiciously low for low mileage. Dealers price on the market. If a car with claimed low mileage is sitting well below similar examples, there's usually a reason.

No MOT history exists. For cars under three years old this is normal, but it removes the most useful independent record of mileage progression. In these cases, the service record and a history check matter even more.

The PCP pipeline is not going away. The FLA expects consumer car finance to hit a record £41 billion in new business in 2025. More cars, more deals, more returns, and with excess mileage charges unchanged, the incentive structure driving clocking will keep doing exactly that.

Checking the mileage history before you buy isn't optional caution anymore. It's the one thing that stands between you and absorbing someone else's financial problem.

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