Right to Reject a Faulty Used Car: The 30 Day Rule Explained

What the 30 day short term right to reject actually covers

The short term right to reject sits inside the Consumer Rights Act 2015, and it's the strongest protection a used car buyer gets in the UK. If the car isn't of satisfactory quality, isn't fit for purpose, or doesn't match how it was described, you can hand it back within 30 days of taking ownership and get every penny refunded. No repair attempt first, no part exchange discount for the miles you've covered, just the money back.

The clock starts on delivery or collection, not on the date you paid a deposit. A fault spotted on day 29 still counts, even if you only noticed it that morning.

Dealer or private seller: the one question that decides everything

The Consumer Rights Act only binds a trader, meaning a business selling cars as part of what it does, a main dealer, an independent garage, or someone trading regularly even from a driveway. Buy privately from an individual selling their own car, and the Act simply doesn't apply. Your only real protection there comes from misrepresentation, meaning the seller lied about something specific, like the mileage or the service history, which is a much harder case to build and prove.

A seller who insists they're just a private individual but has sold six cars this year from the same address is still trading, legally speaking. Our guide to avoiding used car scams covers the other warning signs worth spotting before you even get to this point.

What happens after the first 30 days

Miss the 30 day window and you're not out of options, just into a slower process. Between day 31 and six months, you have to give the dealer one chance to repair or replace the car first. Only if that repair fails, or they can't do it within a reasonable time, do you then get to reject the car or ask for a price reduction instead.

1. Report the fault to the dealer in writing, by email rather than just a phone call, so there's a dated record.
2. Let them attempt one repair or replacement within a reasonable time and without major inconvenience to you.
3. If that repair fails or a second fault appears, you can then reject the car or negotiate a partial refund.
4. Keep every invoice, message and MOT or service record tied to the fault, since the burden of proof shifts to the dealer during these six months.

That burden of proof point matters. Within six months of the sale, it's on the dealer to show the fault wasn't present at the time of sale, not on you to prove that it was. Past six months, that flips, and you're the one who has to demonstrate the car was already faulty when you bought it, which is considerably harder.

Faults this right doesn't cover

• Damage you caused yourself after taking the car, including a crash or an obvious misuse of the controls.
• Fair wear and tear that matches the car's age and mileage, a worn clutch on a 90,000 mile car isn't automatically a fault.
• Anything flagged clearly before you bought it, in writing or on an invoice marked sold as seen, provided that's legal for that type of sale.
• A fault you were specifically told about and agreed to accept, usually noted on the sales paperwork.

A clean MOT history doesn't rule any of this out either way: an advisory from before your purchase can actually support your case if the same issue reappears as a full failure soon after. Our guide to MOT advisory items when buying a used car explains how to read that history before you sign anything.

What to do before you hand the money over

The 30 day right to reject is a safety net, not a substitute for checking the car properly first. Confirm who you're actually buying from, keep every written exchange, and run the checks that catch the faults a refund claim can't easily fix, like a cloned plate or a hidden recall. Our full used car checklist and our cloned plate check both belong in the same five minutes as reading the invoice.