What does a dealer check before selling a car?
Published 20 October 2026 · reviewed 20 October 2026
In one paragraph
A proper pre-sale check goes over the car the way a workshop would: brakes, tyres, steering, suspension, fluids, lights, battery and the MOT history, with anything outstanding put right before handover. At ONECARS that is a 34-point check by ONEFIX, our own workshop on the same site in Wrexham.
What does a dealer check before selling a used car?
A dealer worth buying from puts the car through a workshop inspection before it goes on sale: brakes, tyres, steering, suspension, fluids, lights, battery and electrics, plus a read of the car's MOT history. At ONECARS that inspection is a 34-point check by ONEFIX, our own workshop on the same site at Plas Acton, Wrexham, and the whole list is published at how we check our cars.
Why does it matter who does the checking?
Because a check is only as good as the workshop behind it. Where the inspection is sent out to a third party, the dealer gets a sheet of paper and a bill. Where the workshop is on the same site, the person who finds something and the person who puts it right are in the same building.
That is the arrangement here. ONEFIX is next door, it does the check, and a car with work outstanding from its check is not handed over to its buyer until ONEFIX has put it right. The rule is in the ONECARS system rather than in anybody's memory, which is the point of writing it down.
What should a pre-sale check cover on a used car?
The things that wear, the things that leak, and the things that stop the car. In general terms, a thorough check looks at:
- Brakes — pads, discs, handbrake, and how the car pulls up.
- Tyres — tread depth across the width, age, and whether all four match.
- Steering and suspension — play, knocks over bumps, uneven tyre wear.
- Fluids — oil, coolant, brake fluid, and anything sitting underneath that should be inside.
- Lights and electrics — every bulb, the battery, the warning lights on start-up.
- Body and glass — chips, corrosion, wipers, a windscreen that will pass a test.
- Drive — cold start, gear changes, clutch or gearbox behaviour, noises at speed.
- History — the MOT record and whatever service record came with the car.
A buyer does not need to memorise that list. The useful thing is knowing it exists and asking whether it was followed.
How can you tell the check was actually done?
Look for things that are hard to fake. Every ONECARS car page has the car's photographs, its full spec and its MOT history, and every car old enough to have been tested shows that MOT history from the DVSA, test by test, with the mileage recorded at each test. A dealer that has read the record is happy to publish it; a dealer that has not, usually is not.
You can also check the record yourself. Anyone can check a vehicle's MOT history free on GOV.UK with its registration number — each test's result, the advisories and failures, and the mileage recorded. Compare it with what you are being shown. Our page on how to check a used car's MOT history explains how to read it, and how to tell if a used car's mileage is genuine covers the mileage trail.
Is an MOT the same thing as a pre-sale check?
No. They are two different jobs. An MOT is a test with a date and a result, and a car needs its first by the third anniversary of its registration and then one every year in England and Wales. A pre-sale check is the workshop going over the car before it is sold, and it looks at things an MOT has no interest in — the clutch, the gearbox, how it drives, what is due next.
A fresh MOT on the windscreen is a good sign, not a full answer. The question to ask is what the workshop did as well as the test.
What should you still check yourself?
Your own eyes and your own drive, every time. No inspection replaces sitting in the car and taking it out on a road you know. Two guides cover this properly: what to check when you view a used car and what to look for on a used car test drive. If you would rather go in with a list of questions, we wrote those down too in questions to ask when buying a used car.
Service record matters as much as the check — what does full service history mean? is worth five minutes before you commit.
Does a check change your legal position?
It does not replace it. A dealer cannot sign your rights away with a form of words, and "sold as seen" from a dealer explains why. A good check means fewer reasons to need those rights, which is the honest version of the argument.
What happens after you have bought it?
The same workshop keeps going. Once a car is sold, ONEFIX — the workshop next door — services, repairs and MOTs it, so the people who checked the car are the people who see it next. Every car comes with a free three-month warranty on the engine and gearbox, up to 2,500 miles, with repairs done by ONEFIX on the same site, and longer paid cover is available: see what our warranty covers.
Two other things worth knowing. There is no admin fee here — the price shown is the price paid. And a reservation holds a car for fourteen days, cancellable for any reason within those fourteen days with the fee refunded in full, coming off the price if you go ahead, which gives you room to think without losing the car.
Questions to ask any dealer about its check
- Who carried out the check — your own workshop, or someone else's?
- How many points, and can I see the list?
- Is the MOT history published on the car's page?
- Is anything outstanding from the check done before handover?
- Who services and MOTs the car after I have bought it?
An example on the forecourt at the moment is this 2012 Vauxhall Astra 1.7 Club Ecoflex at £1,295. We are at Plas Acton Garage, 282 Chester Road, Wrexham LL12 8DU, with a second forecourt at Ruyton near Shrewsbury, open Monday to Friday 9 to 5 and Saturday 10 to 4 for viewings by appointment. The office number is 01978 356983 — or use the contact page, or browse the used cars we have in.