The fault tracks back to an breakdown in communication between the encrypted transponder inside your key and the reading unit inside the vehicle cabin. The primary culprits include: Detailed Impact
If your Peugeot records this code in its BSI memory logs, you will likely experience one or more of the following symptoms:
This code is often seen when a Peugeot refuses to start, but its cause can range from a simple dead battery to complex electronic desyncing: Key Recognition: b173d peugeot
When you press the Start/Stop button or insert the key fob into the dash slot, the sends out an interrogation signal via low-frequency antennae. The key fob must respond with a highly specific, encrypted rolling code. If this reply is missing, corrupted, or structurally desynchronised, the BSI flags B173D and denies ignition authorisation. 🛑 Common Symptoms of B173D
Depending on the specific model year and software version (DiagBox or PP2000), the full description may vary slightly, but the core issue remains the same: The has detected a fault in the air quality sensor (also known as the AQS or pollution sensor). The fault tracks back to an breakdown in
The Peugeot BSI is the brain of the vehicle's cabin electronics, managing everything from central locking to transponder validation.
Change the key fob battery out for a fresh, high-quality CR2032 battery. If this reply is missing, corrupted, or structurally
This is the easiest and cheapest first step.
Insert the key and verify if engine start functionality has been restored. Step 4: Live Data Interrogation via OBD Diagnostics
This comprehensive guide breaks down the exact meaning of B173D, its technical root causes, accompanying fault codes, and a structured diagnostic pathway to resolve the issue. 📋 What is Fault Code B173D?
The B173D code is rarely a software issue; it is almost always physical. Common causes include: