A gearbox that fails three months after the sale, a buyer who calls and who reckons you knew. Yet you had written "sold as is, no warranty" on the contract, by hand, and the buyer had signed. Two questions then come up: are you required to pay anything, and does that wording really protect you. The answer depends on three things, and on three things only: the nature of the defect, what was said and written before the sale, and the status of whoever signed as the seller. Here is how those three elements fit together, from the point of view of a used car seller in Switzerland.
What a defect is, under Swiss law
Swiss law imposes a statutory warranty for defects on the seller, whether private or professional. In plain terms: you are answerable for the qualities you promised, and for those the buyer could reasonably expect from a vehicle of that age, that mileage and that price. The key word is "reasonably". Nobody expects a 2014 saloon with 190,000 kilometres on the clock to drive like a new car.
Three situations stand clearly apart. The declared defect: you flagged it, it appears on the contract, the buyer accepted it and paid less because of it. The apparent defect: a scratch, a worn tyre, a noise audible during the test drive, in short anything an attentive buyer could have noticed by looking and driving. The hidden defect: the one that was not detectable when the keys changed hands, and that shows up afterwards.
Only the third category really opens a discussion. And even then, it has to be a defect, not the wear that was to be expected.
Hidden defect or normal wear: where the line runs
This is where most disputes are decided. An eight-year-old vehicle with 160,000 kilometres does not carry the same implicit contract as a three-year-old car still under manufacturer warranty. On the first, a tired clutch, soft dampers, a battery at the end of its life or a turbo losing breath all fall under wear that age and mileage made foreseeable. On the second, the same failure raises more questions.
Wear parts follow their own logic: pads, discs, tyres, belts, filters, dampers. They get consumed, and replacing them is part of the normal cost of ownership. Elapsed time counts too. The further the breakdown happens from the sale, and the more kilometres the buyer has covered in between, the harder it becomes to argue that the vehicle was already defective when it was handed over.
The service file does the rest. A complete book, dated invoices, a consistent history: the discussion closes quickly, because the condition of the vehicle on the day of the sale is documented. An empty file, on the contrary, leaves all the room to interpretation. That is one of the reasons a patchy history costs the seller dearly, as our article on what really sets the price of a used car explains: it is paid once when the price is set, and a second time if a dispute arises.
What the buyer must do, and when
The symmetry is often overlooked on the seller's side: the buyer has obligations too, and they are not decorative.
First, they must inspect the vehicle within a reasonable time after delivery. Next, they must report the defect as soon as they discover it, rather than letting the weeks run in the hope that the failure gets worse, or hunting first for a convenient quote. Finally, they must prove what they claim: that the defect existed before the sale, and that it was not detectable.
These three obligations have precise legal contours that we do not put figures on here, because the applicable time limits depend on the situation and on what the contract provides. Remember the principle: a buyer who drove for months without saying anything, then puts in a claim, stands in a clearly weaker position than one who reported the problem immediately, in writing, backed by a garage diagnosis.
A methodical buyer also reduces that risk upfront, by following the guide to buying a used car in Switzerland. A seller has every interest in facing a buyer of that kind.
"Sold as is, no warranty": what the clause is actually worth
Between private parties, an exclusion of warranty is in principle allowed under Swiss law. It must be written, clear, and set out in the contract signed by both parties. A sentence slipped into a message is no substitute for a contractual clause.
But this clause has a limit that many sellers ignore, and it is decisive: it does not cover anyone who concealed what they knew. A tampered odometer, a major accident kept quiet when its extent was known, a known defect hidden before the viewing, an untruthful answer to a direct question from the buyer. In those cases, the clause does not apply.
Put simply: the clause protects good-faith ignorance, never a lie. A seller who did not know is covered. A seller who knew and said nothing is not, whatever wording appears on the contract.
The professional seller does not get the same treatment
The law frames the professional more strictly. He cannot disclaim as broadly as a private party can, because technical competence and a duty to inform are expected of him, which are not demanded of an owner reselling his own car.
The practical consequence is simple, and it comes before every other question in a transaction: who signs as the seller. That is not an administrative detail, it is what determines who answers the phone call three months later. Depending on the arrangement chosen, the contract may be signed by the private owner or by the garage in its own name. Our article on how consignment selling works sets out both configurations and their consequences, and the three ways to sell your car in Switzerland places each of them alongside the other routes to a sale.
Statutory warranty, commercial warranty, manufacturer warranty
The three terms circulate together in listings and get mixed up in people's minds. They refer to three distinct things.
The statutory warranty comes from the law. It falls on the seller, it is not something you subscribe to, and it is the subject of everything above.
The commercial warranty is a product. It is bought with the vehicle, it has a duration, a list of covered components, a ceiling and often an excess. It does not replace the statutory warranty and does not rest on the same basis.
The manufacturer warranty follows the vehicle, not the seller. It runs from first registration, for a duration and a mileage set by the brand.
Before signing, three questions are enough to frame any commercial warranty: duration, components actually covered, excess. They are among what a buyer checks before signing.
Protect yourself before the sale, not after
Once the call comes in, your room for manoeuvre is narrow. Everything is decided beforehand.
- A written contract that describes the real condition of the vehicle, not a generic formula.
- Explicit mention of known defects, including the ones that embarrass you. A defect declared and accepted stops being a hidden defect.
- The invoices and the service book handed over with the vehicle, with a copy kept for yourself.
- A recent inspection report, which fixes a condition observed by a third party on a known date. Our article explaining how a vehicle inspection works in Switzerland describes what that document covers and what it does not.
- Dated photos of the vehicle on handover day, inside and out, odometer included.
- A test drive done by the buyer himself, not by you.
The central message fits in one sentence: the best protection is not a clause, it is a documented transaction. A clause can be argued over, a file simply speaks for itself.
One obvious point to finish: this article sets out general principles, it does not replace legal advice. Only a lawyer can settle a concrete situation, with the contract in front of them.
When the seller on the contract is no longer you
There is one case where the question changes in nature. In physical consignment, when the vehicle is entrusted to the showroom, the sale may, depending on the arrangement, be concluded by the garage in its own name. The seller on the contract is then no longer you, and it is the garage that answers to the buyer.
This is not automatic and it is not free. It depends on what the consignment contract provides, and it assumes something in return: a garage taking on that role takes a risk, prices it, and in exchange demands a vehicle with a clear history. It is the same logic that runs through the whole subject of selling: the amount that comes back to you rises as the work and the risk stay on your side. Our article on consignment selling gives the full mechanics, formula by formula.
You can also look at our vehicles currently for sale to see how a complete file looks from the buyer's side. And if you are about to sell, or if a buyer has already called you back, the most useful step is to tell us about your situation before signing or answering anything.
