A or a competent automotive electrician with PSA‑group experience will have the necessary tools and knowledge to resolve the issue quickly.
In simple terms, the BSI (Built‑in Systems Interface) is unable to correctly recognize the key you are using. This can involve:
Understanding how B173D works, what causes it, and how to methodically diagnose and repair it can save hundreds of dollars in unnecessary module replacements. Anatomy of Fault Code B173D: How the Immobilizer Works b173d peugeot work
: The central multi-function dashboard display or instrument cluster will show a message stating the remote control is missing or unrecognized.
B173D Fault Code Definition & - The Automotive Technician A or a competent automotive electrician with PSA‑group
: The vehicle might prematurely drop into "Economy Mode" to prevent battery drain because it cannot cleanly establish the "Ignition On" status. Root Causes: Why Is the Key Not Identified?
For keyless systems, a simpler resynchronization method is to put the key in the emergency slot (often located in the steering column or armrest) for about 2 minutes before attempting to start. This allows the key and BSI to re-sync. Anatomy of Fault Code B173D: How the Immobilizer
Engine fault - Have your vehicle repaired: Peugeot / Citroën - klavkarr
While a brake switch sounds like a minor component, modern Peugeots use this signal for:
If you are a Peugeot owner, particularly of modern models like the 3008 , 208, or Partner , encountering a fault code can be stressful. The fault code is a specific diagnostic trouble code (DTC) that can cause significant frustration, ranging from annoying "key not detected" warnings to a complete inability to start your car.
If you have a second key, try it. If the second key works, the issue is with your primary key fob. 3. Check the Car Battery