B173d Peugeot -

If these steps do not work, it is highly likely you have a faulty antenna or a BSI module communication failure, which will require specialized diagnostic equipment to fix.

Peugeot electronic control units are notoriously sensitive to voltage drops. If your vehicle's main 12V battery drops below ~12.2V during a starting request, the BSI may undergo an unexpected reinitialisation or drop data communication packets, resulting in key misidentification errors. 3. Faulty Key Reader or Proximity Antennae b173d peugeot