B173d Peugeot

The root cause of the B173D code is a failure in communication between your key (or remote) and the BSI. This can be triggered by a variety of factors:

If the spare works, the problem is likely with your primary key's hardware. Perform a BSI Reset (Soft Reboot): Open the driver's window and ensure all doors are closed. Switch off the ignition and remove the key.

Before taking the car to a dealership, you can perform these basic checks: Electrical circuit fault: have your vehicle repaired

Understanding the Peugeot B173D Fault Code: Causes, Symptoms, and Solutions b173d peugeot

If the code persists across multiple keys and a clean battery reset, professional diagnostics using Peugeot-specific software like will be required to re-program the keys or check the live data streams of the ignition reader coil.

Open the hood and wait exactly without touching any door handles, buttons, or locks (allowing the BSI to enter sleep mode).

The fastest way to determine if the issue is the or the car is to try the spare key. If the spare works perfectly, the problem is your original key fob. Step 2: Replace Key Fob Battery The root cause of the B173D code is

(a specific sequence of battery disconnection and waiting) to clear these ghost errors. Antenna/Reader Failure:

Before testing the vehicle, eliminate the remote control as a variable.

Reach through the open driver’s window and switch on the sidelights to gently wake up the central system. Switch off the ignition and remove the key

: The coil around the ignition barrel or the hands-free reader may be unable to pick up the key's signal. BSI Software Corruption

The doors may not unlock automatically when you touch the handle.

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.