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.
The simplest cause. If the signal is too weak, the reader near the ignition barrel or in the cabin can't "handshake" with the key.
On Peugeot and Citroën (PSA Group) vehicles, is defined as: b173d peugeot
The car starts fine some days but fails others, often in cold or damp weather.
Turning the key or pressing the Start button does nothing. Peugeot electronics are notorious for throwing "ghost codes"
When B173D is active, you might notice one or more of the following: message on the dashboard.
It sounds simple, but a fresh CR2032 (or similar) battery fixes a significant percentage of B173D errors. After replacing it, you may need to re-sync the key by putting it in the ignition, turning to position 2, and holding the lock button for 10 seconds. If the signal is too weak, the reader
Sometimes the BSI simply needs a reboot. Glitches in the software can lead to a "Permanent Fault" status for B173D even if the key is perfectly fine.
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