The most critical factor is the OEM Part Number matching. Peugeot vehicles use specific pin configurations (e.g., 2-pin, 4-pin, or 6-pin connectors) depending on the model year and series (206, 307, 408, etc.). Buyers must request a wiring diagram or high-resolution photos of the plug interface to ensure it matches the target vehicle's harness. Additionally, confirm if the switch includes the transponder chip slot, as modern Peugeot anti-theft systems (Immobilizers) require the original chip to be transferred or a new one programmed.