"Full service history" is the most valuable three words in a used car advert and the least checked. Most buyers flick through a stamped book at the viewing, see a lot of ink, and nod. Here's how to actually check a car's service history: what the book and the invoices prove, where the digital records live now, and what the history should contain for that particular car.
How do you check a car's service history?
Check it three ways: read the paperwork the seller has, confirm the entries with the garages that made them, and compare what's been done against what the manufacturer says should have been done by that age and mileage. The first two tell you the history is real. The third tells you whether it's actually complete, which is the bit "full service history" claims and almost nobody tests.
In order:
- Ask what form the history is in before you travel. A stamped book, a folder of invoices, a manufacturer's digital record, or a mix. Since 2017 a lot of cars have no paper book at all.
- Read every entry for a date, a mileage and a garage. A stamp without a mileage proves very little.
- Check the mileages against the MOT history. It's free on GOV.UK and records the mileage at every test, so a service stamped at 40,000 miles in a year the MOT recorded 55,000 is a question.
- Ring one or two of the garages. Trading Standards' own advice is to contact the garages that did the work "to verify that all the stamps are valid".
- Check it against the schedule. Was the timing belt done when it was due? Has the car gone longer between services than the manufacturer allows?
What is the advert not telling you?
Paste the advert text and the registration. We read it against the car's DVSA MOT history and our known-faults database, then tell you what the seller left out.
Check an advert now (free) →What does "full service history" actually mean?
There's no legal definition, but it's a claim about the car, and it should mean every scheduled service the manufacturer specifies has been done, on time, with evidence. Not "it's had some services", and not "it's been serviced recently".
It matters because buyers pay more for it, and it's been treated that way when things go wrong. In a 2018 case the Motor Ombudsman upheld a complaint where a car sold with a full service history turned out to have a gap, finding that "the vehicle did not meet its description", and awarded the buyer £750. That was a dealer sale; a private seller's description is still a description, but your protection buying privately is thinner, which is why checking first matters more.
You'll also see these in adverts:
| Advert says | What it should mean | What to ask |
|---|---|---|
| FSH | Every scheduled service done, with evidence | "Is that the book, invoices, or a digital record?" |
| FMDSH | Every service done by a franchised main dealer | "Can you get me the dealer printout?" |
| PSH | Some services are missing | "Which ones, and was the belt one of them?" |
| Fully serviced | Probably one recent service, often before sale | "What about the years before?" |
| Service history | Anything at all | Everything above |
What used car advert phrases really mean decodes the rest of the vocabulary.
What does a stamped service book prove?
Less than people think. A stamp proves that somebody with a garage stamp put it in the book. A good entry has a date, a mileage, the garage's name and ideally a description of the work. A weak one has a stamp and a signature.
The book is also the easiest part of a history to fake, because the stamps themselves are the evidence and a rubber stamp is cheap. The tells to look for:
- Same ink, same pen, same hand across years and supposedly different garages.
- Garages that don't exist, or that closed before the date on their stamp.
- Mileages that are suspiciously round or that don't fit the MOT record.
- A book that's too clean for a car that's ten years old.
- A "duplicate" book. Volkswagen, for example, marks replacement books "Duplicate" and they carry none of the original stamps, so a duplicate on its own proves nothing about the past.
None of those proves fraud. All of them are reasons to ring the garage.
Are invoices better than stamps?
Yes, by a distance. An invoice says what was done, which parts were fitted, at what mileage, on what date and by whom, and it was printed by the garage's own system. It's much harder to forge a convincing set of invoices across several garages than to stamp a book.
Invoices also answer the questions a stamp can't. A stamp says "service". An invoice says whether the service included the spark plugs, the brake fluid, the coolant or the timing belt, and those are the items that get skipped when an owner's trying to keep a bill down. If the seller has a folder, read the big ones first.
How do you check digital service history?
Many cars no longer have a paper service book. Volkswagen UK says that "as of May 2017 our vehicles no longer have physical service books", because service records are held digitally, and other manufacturers have moved the same way: Mercedes-Benz runs a Digital Service Booklet, and Vauxhall offers a Digital Service Record.
For a buyer, that changes the question from "can I see the book?" to "can I see the printout?". On a Volkswagen, for example, a VW retailer can print the digital history on request, but it can't see work done outside the Volkswagen network unless the independent garage entered it into the system. The practical route is to ask the seller to get the printout from a franchised dealer before you view, or to bring the dealer's name so you can ask.
There's also a whole category of paid service-history lookups that retrieve manufacturer and dealer records by registration or VIN, without the seller's involvement. We don't sell one, so here they are, as their own pages listed them on 9 October 2026:
| Service | Price shown | Notes from their own page |
|---|---|---|
| FindServiceHistory | £9.99 | Records from manufacturer systems, "most European vehicles from 2012 model year onwards"; card authorised, not charged, if nothing is found |
| Full Car Checks | £8.99 | Manufacturer and dealer network records with dates and mileages |
| Car Analytics | £10.99 (Digital Service Book Check) | Full refund if no data is found; says it doesn't promise every service |
| VinHistory | £19 per brand report | PDF dealer reports for a list of mainly German and premium brands |
Coverage is the catch with all of them. They find what was recorded in a manufacturer's or dealer's system. A car serviced by an independent that never logged the work will come back thin or empty, which is not the same thing as never serviced.
How do you check the history is complete for that car?
Compare what's been done against what should have been done, item by item. This is the step "full service history" is supposed to have taken care of and the one nobody checks, because the schedule isn't printed in the advert.
What to look for:
- Gaps in time. Most cars have a maximum interval in years as well as miles. A low-mileage car that went three years between services wasn't serviced on schedule, however few miles it did.
- The timing belt. It's changed by miles or years, whichever comes first, and it's the expensive one to get wrong because a snapped belt usually means a new engine. Look for an invoice that names it. On wet-belt engines the intervals were shortened after the cars were sold, so a car serviced to the original schedule can still be overdue; see which cars have a wet belt.
- The big services. Spark plugs, brake fluid, coolant and transmission fluid fall due less often than oil changes, which is exactly why they get missed.
The MOT history is the cross-check that ties it together. It records the mileage at every test, so you can see whether services happened at sensible points, and its advisories show whether the car was being looked after between services or just signed off. MOT advisories explained shows how to read them.
What if the car has no service history?
Price it as though nothing's been done, then decide. A car with no history isn't automatically a bad car, and lost paperwork can often be reconstructed by ringing the garages the seller names. The risk concentrates in the timing belt. Buying a car with no service history goes through the sums and the questions in detail, including when to walk away.
Which parts of this can a check do for you?
Start with what we don't do: we don't retrieve manufacturer or dealer service records. If you want the official digital printout without asking the seller, the paid lookups above are the tools for that job, and on a car serviced at main dealers they're worth the money. And like every check on the market, ours reads the same official DVSA MOT record that's free on GOV.UK.
What we do is the half of the job those lookups and that record leave to you: working out whether the history you're being shown is the history this car should have.
That's the Smart Check's job. It matches the car against our confirmed service-interval data, 308 verified intervals across 42 makes, so it knows which belt or chain this engine has, when it's due by miles and by years, and what other scheduled items owners routinely skip. It lays that against the MOT history to build a service timeline, and against the advert, so "FSH, cambelt done" meets what the record actually supports. It also checks the known faults for that model, from 871 documented faults, prices them, and turns the gaps into the specific questions to put to the seller, with a figure to negotiate from if the answers come back thin. "Has it got a full service history?" gets you a yes. "When was the cambelt done, and can you send me that invoice?" gets you the truth.
The free scan is where it starts: it reads the advert against the full MOT history and gives you a verdict, a risk score and the biggest single finding, with no card and no password.
What none of it can tell you is whether a stamp is genuine or a belt was really changed. Only the garage that did the work can confirm that, and only an invoice proves it. That's still a phone call you have to make.
So what should you actually do?
Put the registration and the advert into the free scan before you go and look at the book. If the car's worth pursuing, upgrade that report to the Smart Check to see the schedule for that exact engine against what the record shows, and walk into the viewing knowing which invoice to ask for. The upgrade runs on the same link with nothing re-run, so starting free costs you nothing if the first answer is don't bother.
