guarantee
The French word 'garantie' is used in a similar way to the English word 'guarantee'. It is a promise or assurance that a product or service will meet certain standards or expectations. For example, a company might offer a 'garantie de satisfaction' (satisfaction guarantee) to ensure that customers are happy with their purchase.
The warranty of this product is expired.
This sentence is used to express that the given period during which the product would be repaired or replaced by the seller or manufacturer has ended.
Does the warranty cover water damage?
This question is typically asked to know if the warranty of a product covers the situations where the product gets damaged by coming in contact with water.
You can extend the warranty for an additional year.
This is an example of where someone gives an option or possibility to lengthen the period of warranty.