B173d Peugeot Work |best| [ INSTANT — 2025 ]

This is the most common cause. Even if the light on the fob turns on, the battery might not have enough voltage to transmit the passive code to the car. Change it with a high-quality, new battery 1.2.1. 2. Try the Spare Key

[Key Fob / Transponder] ──(Wireless Signal)──> [Ignition Switch Reader / Slot] │ (Data Packet) ▼ [Engine Management ECU] <──(Validation Request)─── [BSI Computer] b173d peugeot work

A or a competent automotive electrician with PSA‑group experience will have the necessary tools and knowledge to resolve the issue quickly. This is the most common cause