First Claim Letter to the Manufacturer: Date, Describe, Invoke Article 1641

When an AdBlue or Haldex failure appears, a telephone call or an email to the manufacturer is rarely enough. If you want to keep open the possibility of a hidden-defect claim, the first step is a formal written complaint. This letter creates a dated record of the problem and gives it a legal basis.

What the first letter must contain

Your letter should contain three essential elements:

• The date of the defect. State when the failure first appeared, as precisely as possible.
• A description of the defect. Describe the symptoms, the circumstances, and the consequences for the vehicle. Be factual and specific.
• The legal basis. Invoke Article 1641 of the Civil Code, the provision on hidden defects. This is what turns a simple complaint into a claim that can support a later dispute.

How to send it

Send the letter by registered mail with acknowledgement of receipt. Keep a copy of the letter and the proof of delivery. This gives you a verifiable timeline if the manufacturer rejects the claim or does not respond.

AdBlue and Haldex failures are not limited to an accessory problem. The SCR system is inseparable from engine operation, and an AdBlue fault can make the vehicle unusable by software decision. On a 4-wheel-drive vehicle, a Haldex pump failure can occur when the coupling oil has been neglected. The letter should describe the observable facts in a way that preserves your rights.

Why this matters

The first letter fixes the date on which you informed the manufacturer of the defect. That date is central to any hidden-defect case. It also places the failure in the legal category of a defect that may make the vehicle unfit for its intended purpose, rather than a simple maintenance issue.

Whether the failure concerns an AdBlue system or a Haldex coupling, the legal starting point is the same. The technical causes are different, but the groundwork for a hidden-defect claim begins with the same written step.

Register your case

Once the letter is sent, register your case in the independent registry hosted by this site. Registration does not replace the letter, but it helps build a collective record of the scale of these failures. You can join this approach on adblue-haldex.com.