Welcome to AF. PSA uses engines across several models of Peugeot and Citroen, and you increase the odds of a reply by giving the engine in your car. Letters 6-7-8 of the VIN.
Thanks for your reply. It's a 2008 407SV biTurbo diesel with Vin: VF36DUHZJ21743040 and engine number 10TRD203202903
If you have any diagrams to share that would be greatly appreciated