B173d Peugeot Work __top__ -

If you’ve plugged a diagnostic scanner into your Peugeot and discovered the cryptic code , you might be confused about what it means. The full description is: "Fault in identifying the mechanical/electronic key or the hands-free remote control present in the reader."

The keyless entry antennas, which detect the presence of the key, are failing.

Another owner reported that after driving for 15–20 km, the "engine failure" message would appear, accompanied by codes B173D, B1808, B1137, and B1744. All systems appeared to work normally. The forum consensus pointed to a as the most likely cause, because low voltage or poor earthing can trigger a cascade of unrelated codes. b173d peugeot work

When this code triggers, the vehicle's Built-in Systems Interface (BSI)—the central body control module—cannot establish a secure, verified connection with the key transponder or keyless remote. This breakdown in communication locks down the vehicle's immobilizer system, directly preventing the engine from starting.

As a last resort for very old vehicles, some ECUs can be modified to ignore the immobilizer signal ("Immo Off"). If you’ve plugged a diagnostic scanner into your

: A temporary communication error within the BSI can lead to "unexpected reinitialization" and key recognition failure.

The most common point of failure lies within the handheld key fob itself. Over time, the internal CR2032 or CR2016 battery weakens, decreasing the transponder signal's amplitude until the reader can no longer capture it. Alternatively, dropping the key fob can crack the internal PCB trace or dislodge the delicate surface-mounted transponder chip. 2. Faulty Ignition Switch Reader Coil or Antenna All systems appeared to work normally

Disabling cruise control when the brake is pressed. Stability Control: Engaging ABS and ESP modules. Lighting: Activating the rear brake lights.

Reconnect, wait 10 seconds, then turn on the side lights through the window to "wake" the system.