Your first claim letter to the manufacturer: what it should contain

A factual first step

If your vehicle has an AdBlue® (SCR) failure or a Haldex® all-wheel-drive failure, your first letter to the manufacturer should create a clear record. It should not be a general complaint. The letter must date the defect, describe it, and invoke Article 1641 of the French Civil Code. That article is the legal reference to use under hidden-defect law. The aim is to set out facts that can later support a consumer-protection or hidden-defect argument.

For an AdBlue failure, describe what happened in factual terms. The source material states that an AdBlue failure is not just a faulty accessory: the entire vehicle becomes unusable by software decision. If that is your situation, say when it happened and what the vehicle did. Keep to what you observed and what was reported to you. Do not add a technical diagnosis you cannot support.

For a Haldex failure, describe the symptoms and any fault code logged. The source notes that fault code C111204 may be logged in this context. It also explains that on many VW, Audi, Škoda and Seat vehicles with DSG and Haldex, the two systems are separate. Changing the DSG oil does not service the Haldex. A “complete transmission service” may not be complete if the Haldex has been left out. If your invoice mentions only the DSG, the Haldex has not been serviced. The source also states that the Haldex pump can fail before 50,000 miles, and that a periodic Haldex oil change at roughly every 40,000 km prevents sludge. These points can help you describe the maintenance history without inventing anything.

Form and record-keeping

Send the letter by registered mail with acknowledgment of receipt. Keep a copy of the letter. Keep the proof of sending. This creates a dated record of your report. The letter should stay sober and precise: date the defect, describe it, invoke Article 1641, and keep the documents together.

Then register the case in the census. Registration is how owners join the collective approach and help map the scale of these defects. It does not replace the letter, but it adds your case to the wider record.