Defect or Guarantee? What Really Applies When Buying a Used Car

What is a defect?

A vehicle has a defect when, at the time of handover, it does not have the condition that was contractually agreed or that the buyer can normally expect given the type of vehicle. That sounds abstract — in practice, the cases are often very concrete:

• An accident was not disclosed before the purchase, even though the seller knew about it.
• The stated mileage does not match the actual figure.
• A component (engine, gearbox, air conditioning) was already faulty at the time of handover, even if the fault only became visible later.
• The vehicle was listed as accident-free but shows signs of repairs to load-bearing parts.

What matters is this: the defect must already have existed at handover. A fault that clearly arose after the purchase through normal wear or improper use is not a defect within the meaning of the law.

The legal basis for defects is found in § 434 BGB (German Civil Code) — phrased cautiously, because the specific interpretation always depends on the individual case and a lawyer should be consulted for disputed questions.

Liability for defects: what the buyer can demand

If a defect exists and statutory liability applies, the buyer generally has the following rights — in this order:

1. Subsequent performance (repair or delivery of a defect-free vehicle): this is the first step. The seller has the right to remedy the defect before the buyer can assert any other claims.
2. Withdrawal or price reduction: if subsequent performance fails, the seller refuses it, or it is unreasonable, the buyer can withdraw from the purchase contract or reduce the purchase price.
3. Damages: under certain conditions (in particular, fraudulent concealment), the buyer can also claim damages.

That sounds straightforward — but in practice the hurdles are high. When subsequent performance has "failed", what deadline must be set, and what counts as "unreasonable" are legal questions that are hard to answer without legal advice.

Important note: this is not legal advice. For specific disputes over defects and warranty, you should always consult a lawyer or a consumer advice centre.

Time limits: how long does liability for defects apply?

The statutory limitation period for a purchase contract is generally two years from handover. When buying a used car from a dealer (B2C), this period can be contractually shortened to one year — that is common in the market and legally permitted.

An important detail is the so-called reversal of the burden of proof: in the first twelve months after handover, the law presumes that a defect that appears was already present at handover. The seller must prove otherwise. After twelve months this reverses — the buyer must then prove that the defect was already present at handover. In practice, that is often difficult.

This interplay of time limit and burden of proof makes clear why the time of purchase is so decisive — and why documenting the vehicle's condition before the purchase can be more valuable than many people think.

What is a guarantee — and what is not?

A guarantee is not a statutory obligation. It is a voluntary commitment by a manufacturer or dealer that goes beyond what the law requires. Typical forms with used cars:

Manufacturer's guarantee: applies to new vehicles from the factory for a defined period. With used cars, the key question is whether this guarantee still runs and whether it is transferable to a reseller — that is governed by the respective manufacturer's guarantee terms, and the answer is not always yes.

Dealer guarantee / used-car guarantee: some dealers offer their own guarantee packages. These only cover what is stated in the guarantee document — term, covered components, exclusions, and the procedure in a claim are individually defined. When in doubt: read the fine print.

No guarantee without an express commitment. A dealer who promises nothing in writing gives no guarantee — even if he says "no problem" verbally.

Liability for defects vs. guarantee: the direct comparison

	Liability for defects	Guarantee
Basis	Law (BGB)	Voluntary commitment
When buying from a dealer	Automatic, cannot be excluded	Only if granted
When buying privately	Can be excluded by contract (and usually is)	Only if the manufacturer's guarantee still applies and is transferable
Time limit	Up to 2 years (often 1 year for used cars)	Per the guarantee terms
Who is liable	The seller	The guarantor (manufacturer or dealer)
What is covered	Defects present at handover	What the guarantee certificate states

Why an on-site check before the purchase makes so much sense

Anyone who has to invoke liability for defects or a guarantee after the purchase is already in a dispute — with an uncertain outcome, effort, and possible legal costs. An independent used-car inspection before the purchase turns this logic around: defects are identified before anything is signed.

checkdenwagen sends a qualified vehicle appraiser directly to the vehicle — to the dealer or a private address, Germany-wide, from €289 incl. VAT and travel. The inspector assesses the bodywork, the mechanics, the documents, and the overall condition. The result: a written report on which the buyer can base a decision — and, when in doubt, renegotiate the price.

Anyone who knows the defects before the purchase doesn't have to argue about liability for defects or a guarantee afterwards.