While a faulty key is the most obvious culprit, B173D is often a symptom of wider electrical "confusion" in the Peugeot's complex BSI system.
On Peugeot and Citroën (PSA Group) vehicles, is defined as:
Peugeot electronics are notorious for throwing "ghost codes" when the main 12V battery is dying. Low voltage during the start-up sequence can cause the BSI to fail the key identification check.
B173d — Peugeot
While a faulty key is the most obvious culprit, B173D is often a symptom of wider electrical "confusion" in the Peugeot's complex BSI system.
On Peugeot and Citroën (PSA Group) vehicles, is defined as:
Peugeot electronics are notorious for throwing "ghost codes" when the main 12V battery is dying. Low voltage during the start-up sequence can cause the BSI to fail the key identification check.