Several factors can cause the B173D fault code to appear on a Peugeot vehicle. Some of the most common causes include:
The Service light, Airbag/Pretensioner light, or ESP/ASR warning icons may illuminate.
. At first, it seems simple: maybe the key fob battery is just weak. You swap it out, but the code remains "permanent". The mechanic explains that in modern Peugeots, the BSI acts as a communication hub