A fault appearing days after you collect a used car can turn an exciting purchase into an urgent legal problem. If you bought from a dealer, you are not limited to whatever warranty the salesperson offered. The Consumer Rights Act 2015 requires a vehicle sold by a trader to be of satisfactory quality, fit for any purpose made known to the seller, and as described.
Those standards are judged in context. A ten-year-old car with high mileage is not expected to be flawless, but age and price do not give a dealer permission to sell a vehicle with undisclosed defects that make it unreasonably unreliable or unsafe. Normal wear and tear, a fault disclosed before sale, or damage you caused yourself is different.
Your rights in the first 30 days
If the car fails to meet the legal standards within the first 30 days after delivery, you may have the short-term right to reject the car and claim a refund. This is one of the strongest used car buyer rights in the UK when a serious fault appears almost immediately.
You do not have to accept a repair instead of exercising a valid short-term right to reject. You can choose a repair, but the dealer cannot simply replace your statutory rights with a warranty process. Tell the selling dealer clearly that you are rejecting the vehicle under the Consumer Rights Act 2015, explain the fault and put the notice in writing.
For example, suppose you buy a six-year-old diesel from a dealership and ten days later it repeatedly loses power because of a significant engine-management fault that was not disclosed. Obtain diagnostic evidence, notify the dealer immediately and state the remedy you want. Avoid authorising major repairs elsewhere before giving the seller a chance to inspect the car.
After 30 days but within six months
Once the first 30 days have passed, the usual Consumer Rights Act car remedy changes. In most cases, you must give the dealer one opportunity to repair or replace the vehicle before moving to the final right to reject or a price reduction. The repair or replacement must be completed within a reasonable time and without significant inconvenience.
If a fault becomes apparent within the first six months, the law generally presumes that the problem existed at delivery unless the trader can show otherwise, subject to the nature of the goods or fault. This can matter when a faulty used car dealer argues that a major defect must have developed only after the sale.
If the repair fails, the same fault remains, or the legal conditions for the next remedy are met, you may be able to seek a price reduction or exercise the final right to reject. For motor vehicles, a refund after the short-term rejection period can include a reasonable deduction for the use you have had from the car, often assessed with reference to mileage.
What if the fault appears after six months?
Your rights do not automatically disappear at six months. The main change is evidence. After that point, it is generally for you to show that the problem reflects a defect or lack of durability that was present at delivery rather than ordinary wear, misuse, an accident or a later event.
An independent engineer’s report or detailed diagnosis from a reputable garage can be useful. The car’s age, mileage, price, service history and expected lifespan of the failed component all matter when deciding whether the vehicle was of satisfactory quality.
How to protect your right to reject a car
Contact the seller promptly
Your claim is normally against the trader that sold you the car, not the manufacturer. Describe the symptoms in writing and ask how the dealer wants the vehicle inspected. If the car may be unsafe, stop driving it and discuss recovery rather than risking further damage.
Build an evidence file
Keep the advert, invoice, finance documents, messages, photographs, diagnostic reports, recovery receipts and a timeline showing when the fault appeared. Record the mileage when the problem started. This is especially useful if the dealer claims the defect resulted from your use.
State the remedy you want
A vague message saying the car is “not right” is less useful than a dated complaint identifying the defect and remedy. If you are within 30 days and intend to reject, say so clearly. If you are outside that period, give the dealer the required repair or replacement opportunity where the Act requires it.
Before buying again, useful related guidance includes checking a used car history, spotting dealership red flags and understanding car finance agreements.
Dealer purchase versus private sale
The Consumer Rights Act protections above apply when a consumer buys from a trader. A genuine private sale gives much more limited protection. A private seller must not misdescribe the car and must have the right to sell it, but you generally cannot demand dealer-level satisfactory-quality protection simply because the vehicle later develops a fault.
If someone claims to be a private seller but is actually trading cars as a business, that label does not necessarily remove consumer protections. Keep screenshots of adverts and seller details if the circumstances suggest disguised trading.
What if the dealer refuses to help?
Use the dealership’s formal complaints procedure and keep everything in writing. If the business is accredited to The Motor Ombudsman, an unresolved dispute can generally be escalated after you receive the dealer’s final response or after allowing up to eight weeks for one. Depending on the case, other routes may include Citizens Advice, alternative dispute resolution, a finance provider or court action.
Frequently asked questions
Can I return a faulty used car within 30 days?
If you bought from a dealer and the vehicle breaches the Consumer Rights Act standards, you may be entitled to use the short-term right to reject within 30 days. Simply changing your mind is not the same as rejecting a faulty car.
Does a dealer have to repair a faulty car?
After the first 30 days, the dealer will usually have one opportunity to repair or replace before you can move to a price reduction or final rejection. Within the first 30 days, you can choose a repair, but a dealer cannot force one instead of a valid short-term rejection.
Does a three-month warranty limit my legal rights?
No. A dealer warranty is additional to your statutory rights and cannot remove the protections you have under the Consumer Rights Act 2015.
Can I use The Motor Ombudsman for any dealer?
No. The Motor Ombudsman generally handles disputes involving businesses accredited to its relevant Codes, after the dealer has had the required opportunity to resolve the complaint.
Act quickly and keep the evidence
The best response to a faulty used car is prompt, documented action. Work out whether you are inside the first 30 days, between 30 days and six months, or beyond six months; contact the selling trader in writing; preserve diagnostic evidence; and ask for the remedy that fits your stage of the Consumer Rights Act process. Acting early makes it easier to protect your position and avoid a dispute becoming your word against the dealer’s.
