| Error | Solution | | :--- | :--- | | "VIN not recognized" | Check for typos. For vehicles pre-1999, use RPO + model. | | "Diagrams not loading" | Disable ad-blocker. Clear cache (especially for SVG files). | | "Payment rejected" | Some banks block French merchants (PSA is based in Poissy). Use PayPal option. | | "Access denied – Dealer only" | You attempted to write to an ECU. Public Box is read-only for diagnostics. |