The wires leading from the switch to the Built-in Systems Interface (BSI) can become frayed or corroded, especially in older models like the Peugeot 308 or 508.
The B173D fault code in Peugeot and Citroën vehicles (notably C4 Picasso, 308, 3008, 5008) indicates a failure in the BSI (Body Systems Interface) to correctly identify the mechanical or electronic key, or the hands-free remote control. This often leads to "key not detected" errors, central locking malfunctions, and non-start situations where the engine cranks but does not fire. 2. Technical Description B173D / B173D:86 (Intermittent) b173d peugeot work
When this code appears, the vehicle's security system is having trouble recognizing the transponder signal from your key. Common symptoms and context for this fault include: The wires leading from the switch to the