Used-car guarantee: what the dealer is really selling you

Guarantor: who really pays the garage invoice when something breaks

Behind the word guarantee at a dealership there are three different constructions. With a dealer's own guarantee, the selling business itself undertakes to cover certain repairs — often with a backing policy (Rückdeckungsversicherung) in the background that does not protect you, but the dealer's commercial risk. With a brokered guarantee product you sign your own contract with a guarantee provider, or take out repair-cost insurance (Reparaturkostenversicherung); your claim then lies against that company and not against the dealership. Third, there is the manufacturer's warranty from a carmaker's approved used-car programme, which is handled through the franchised dealer network.

The decisive piece of information is therefore not whether an insurer is involved somewhere, but who is named as the guarantor in the guarantee certificate (Garantieurkunde). Your claim lies against that party alone. If the dealership is named there and the insurance merely provides its backing, then depending on the conditions you have no claim of your own against the insurer — in which case the promise is worth as much, commercially, as the business that gives it, and in an insolvency little of it usually remains. Whether the conditions grant you a direct claim against the insurer, or whether you are even the policyholder (Versicherungsnehmer) or an insured person yourself, is set out in the documents and is the point you have to clarify: only if you are a party to an insurance contract yourself do the rules of German insurance contract law, and the complaint routes it provides, apply to you.

Where the repair may be carried out also differs. A dealer's own guarantee usually ties you to precisely that business — impractical as soon as you move house or the fault occurs several hundred kilometres away. Provider products often allow a freer choice of garage within their conditions, but require a formal approval procedure in return. Manufacturer programmes generally give the broadest cover and are handled routinely within the franchised network, but they cost more and are only available for vehicles below certain age and mileage limits. Ask the seller three questions and have the answers in writing: who is named in the certificate as guarantor, with name and address? Who transfers the money to the garage? And if the business itself is the guarantor — do the conditions give me my own claim against the insurer behind it?

None of this affects the statutory warranty (Gewährleistung): it arises automatically when you buy from a dealer, covers defects that were already present at handover, and on a used car may only be shortened to one year if that was expressly and separately agreed; in the first year after handover, a consumer sale also gives you the reversal of the burden of proof under § 477 BGB (German Civil Code). A guarantee, by contrast, is a voluntary undertaking under § 443 BGB whose content can be freely defined. Both sets of rights exist side by side, and anyone who offers you the guarantee in return for waiving the statutory warranty is claiming something that is legally wrong. If you want to go deeper into the difference in principle, you will find it in the articles on material defects and guarantees and on the statutory warranty when buying from a dealer.

Positive list or full guarantee: how to read the scope of cover in the certificate

Guarantee conditions are built in one of two ways. The widespread variant is the positive list: only what is named explicitly is covered. Typically it lists the core of the drivetrain and a few expensive ancillaries — internal engine parts such as the crankshaft, connecting rods, pistons, camshaft and oil pump; in the gearbox, the gears, shafts and synchroniser rings and, on an automatic, the torque converter; plus the differential and driveshafts, and depending on the product also the steering rack and power-steering pump, starter and alternator, water pump and thermostat, master brake cylinder and brake servo, or the air-conditioning compressor. The second variant is sold as a full guarantee and works with a catalogue of exclusions: in principle everything is covered except the exceptions listed. With a positive list, in case of doubt you have to show that your defective component appears on it; with a catalogue of exclusions, the provider has to justify why an exclusion applies. So go through the list line by line and distrust shorthand formulas such as “engine, gearbox, drivetrain” with no itemised breakdown.

Just as powerful is the question of which items on the garage invoice are reimbursable at all. Check whether only replacement parts are covered or the labour as well — reimbursement of parts costs alone is almost worthless on jobs with laborious removal and refitting, because on a gearbox or a timing chain the labour share can exceed the price of the parts. If the hourly labour rate is capped, for instance at a locally customary rate for independent garages, you pay the difference yourself at a franchised garage. Also clarify whether diagnosis, fault-finding and dismantling are paid for when the suspicion is confirmed, and who bears them if it is not. Ancillary costs such as towing, a hire car or an overnight stay are separate, sometimes chargeable modules in many contracts, as are consumables such as oil and coolant.

At the end comes the reduction mechanism. Ask specifically about the order: whether the depreciation rate (Zeitwertquote) is applied to the invoice total first and the excess deducted afterwards, or the other way round, changes the payout noticeably. Many contracts additionally scale the reimbursement rate by mileage or vehicle age, so that your share rises with every year, and cap the benefit per individual claim and per contract year — sometimes additionally at the current market value (Zeitwert) of the vehicle, which on an older car can be the real upper limit. Have the calculation demonstrated to you on a realistic example for this model, say a gearbox failure with a four-figure invoice, and have the payout figure written down.

What is almost never covered: wear, electronics and consequential damage

The largest block is wear parts. Clutch, brake pads and discs, dampers, exhaust system, battery, tyres, spark and glow plugs, filters, timing belt and wiper blades fall outside cover in practically every case, in both designs. It becomes tricky when the conditions exclude “wear” across the board without defining what falls under it: on a car with six-figure mileage, almost any failure can be classified as age-related wear, and even a component that appears on the positive list can be refused on that basis. So ask for the passage in which wear is defined or delimited — if it is missing, the component list is worth less than it looks.

The second block is the electronics. Comfort and infotainment systems, control units, sensors and driver-assistance systems are frequently excluded or only included in more expensive product tiers, even though it is precisely these that get expensive on modern vehicles. The same applies to exhaust after-treatment with the particulate filter, EGR valve, catalytic converter, lambda sensor and AdBlue dosing, to the turbocharger and injection system, and to the high-voltage battery in hybrids and electric vehicles. Bodywork, paint, rust, glass, the interior and plain leaks lie outside such products anyway.

On top of that come three exclusions that put the rest into perspective. Consequential damage is often only reimbursed if the component that caused it was itself covered — if a part that is not covered destroys a covered engine, the benefit can fall away. Damage that was already present or discernibly developing when the contract was concluded is never covered, because a guarantee insures the sudden failure after conclusion and not the condition before it. And damage caused by an accident, operating error, the wrong fuel or neglected servicing is excluded. In practice this means: hold the component list up against the known weak points of exactly this model at exactly this mileage. If the typical failures of your engine or gearbox appear in the exclusions column, you are buying cover for damage that rarely occurs on this vehicle.

Your duties: proof of servicing, tied garages and reporting before the repair

Almost every used-car guarantee requires a complete servicing history in line with the manufacturer's specification. The time interval and the mileage interval both apply, and whichever is reached first counts — so a low-mileage driver not infrequently loses cover via the time interval. Whether a tolerance window is allowed is set out in the conditions and differs from provider to provider. As proof, invoices showing the date, the odometer reading and the work carried out are usually accepted; a mere stamp in the service booklet (Serviceheft) is not enough everywhere. This is exactly where the most expensive trap at purchase lies: if the vehicle has a patchy service record (Scheckheft), a basic precondition of the guarantee may already be impossible to fulfil on the day you sign. In that case, clarify before you conclude the contract from what point the duty of proof applies, whether past gaps are harmful, and whether the provider requires an initial inspection or a service to be carried out retrospectively.

The second duty is being tied to a garage. Some conditions require the brand's authorised garages, others their own partner network, and others again allow independent garages, provided the work follows the manufacturer's specification and uses suitable parts. Distinguish between the tie for routine servicing and the tie for repairing damage — the two can be governed separately. Anyone who has the car serviced regularly at an inexpensive independent garage should have it confirmed in writing beforehand that this servicing will be recognised; otherwise the annual saving turns into the loss of the claim when damage occurs.

The third duty is the formally most important one: the damage must be reported to the guarantor and the repair approved before the garage starts. It is customary for the diagnosis and cost estimate to be submitted, for the guarantor to be allowed to have the component inspected, and for it to have a say in how the repair is done — repair instead of replacement, or a used part instead of a new one. On top of that comes the duty to keep the damage small: anyone who drives on with the oil-pressure or coolant warning light lit risks the benefit for the consequential damage. If the repair is already under way before it was reported, that does not in every case automatically mean a complete loss of cover — with insurance-based products it depends on whether the breach of duty was causal for the damage or for establishing it at all, and that is proof you have to provide. You should not rely on it, though: note down the reporting deadline, the telephone number and the online address for reporting damage from the conditions before you need them.

Mandatory information in the guarantee statement — and how to get it before you sign

For guarantees given to consumers, § 479 BGB (German Civil Code) sets requirements as to content. The statement must be drafted in plain, intelligible language and must, among other things, contain the note that the statutory rights in the event of a defect remain in place and are not restricted by the guarantee, plus the name and address of the guarantor, the procedure you have to follow to make a claim, and the terms of the guarantee and the item it relates to. It has to be made available on a durable medium, that is on paper or as a PDF — a verbal promise in the showroom is not enough.

If one of these details is missing, the guarantee remains effective nonetheless; the formal error is therefore not to your detriment, but it does say something about the provider's diligence. More important are the details the law does not require and that you therefore have to look for actively: the term together with the mileage ceiling at which cover ends, the geographical scope, the maximum sums per claim and per contract year, and the amount of the excess. Equally important is the designation of the product including its tier and the version of the conditions, because providers run several levels of cover under similar names.

The timing is the point at which most buyers lose out. Legally it is enough for you to receive the guarantee statement at the latest on delivery — but by then you can no longer negotiate, because the purchase contract has long been signed. So request the complete conditions before you sign and have them attached to the purchase contract as a named annex. If the purchase contract contains only the word “guarantee” with no product designation and no annex, it will later be disputed which product at which level was owed at all.

Is this particular offer worth the money? Checking and negotiating

Three questions decide it, and in this order. First: does the component list cover the assemblies that realistically fail on this model, at this mileage and in this condition? Second: can you fulfil the servicing and documentation duties in full with the history that exists? Third: after the excess, the depreciation rate and the maximum sums, is there an amount left over that would noticeably relieve you in an expensive repair? If one answer is no, that is no reason to walk away from the vehicle — but it is a reason not to accept the guarantee as a component of value in the price. Whether an extended guarantee is worth it later on is covered in the article on guarantee extensions.

One simple step helps when negotiating: have the price of the guarantee itemised separately. “It is included” as a rule means the cost is priced into the vehicle, and makes the item non-negotiable. As soon as the amount is visible, you can set it against two alternatives: the same amount as a price reduction, or as a bindingly promised rectification of specific defects before handover, with the work named and a date set in the purchase contract. The second variant is often worth more, because it removes a certain fault instead of partly covering an uncertain one. And a guarantee is not a quality seal: it says nothing about the condition of the car, only which risk a provider is prepared to carry on which terms.

Clarify these points before you sign:

• Servicing has to be carried out in full at the selling business, without the prices or the scope of that work being agreed.
• The conditions prescribe shorter service intervals than the manufacturer, without this being pointed out during the sales talk.
• “Wear” is excluded across the board, without the conditions defining what falls under it.
• Reimbursement is made exclusively at current market value, with no minimum rate and no sample calculation.
• Damage is reported exclusively via the seller, with no direct contact details for the guarantor.
• The guarantee is not transferable on resale — a running, transferable remaining guarantee is worth hard cash when you sell the car on.

Know the condition before you decide about the guarantee

All three assessment questions presuppose the same piece of information that nobody has on the table during the sales talk: the vehicle's actual technical condition. Without it there is no telling whether the component list matches the real weaknesses — whether the oil leak at the engine has already begun, whether the brakes are due within the foreseeable future, whether the automatic gearbox shifts cleanly, or whether fault-memory entries point to electronics that are excluded anyway.

checkdenwagen sends an independent inspector to the seller anywhere in Germany, checks over 100 points in approx. 1.5 hours on-site and delivers the written report within 24 hours; you do not have to be present. The Standard Check costs from EUR 289 incl. VAT and travel, the Premium Check from EUR 339 incl. VAT and travel, including a market-value assessment.

With the report in hand you decide in the right order: first you know which assemblies are a risk on this particular car, then you check whether the guarantee on offer covers precisely those — and, depending on the findings, you negotiate about the rectification of specific defects, about the price, or about both.

Important note: This article is general information and does not replace legal advice. Whether a specific guarantee clause is valid and which claims you have in an individual case depends on the contract concerned. In the event of a dispute, contact a solicitor or a consumer advice centre (Verbraucherzentrale). checkdenwagen is an independent inspection service for pre-purchase advice, not a damage assessor.