: The hands-free proximity function might stop unlocking the doors as you approach the vehicle.
When this fault triggers, the vehicle's Built-in Systems Interface (BSI)—the central body control module—is unable to validate the encrypted security code sent by your key transponder or keyless access module. Consequently, the engine immobilizer remains active, often preventing the engine from starting entirely.
Before spending hundreds at a dealership, try these steps in order: 1. Replace the Key Fob Battery
The fault typically stems from a breakdown in communication between the encrypted transponder inside your key and the reading slots/antennas inside your Peugeot.