B173d Peugeot Link

The Peugeot fault code B173D identifies a failure in the recognition of the mechanical or electronic key (or remote control) by the vehicle's immobiliser system. This diagnostic trouble code (DTC) is commonly associated with Peugeot and Citroën vehicles, particularly when the car fails to start or displays a "key not detected" warning. Understanding B173D: Causes and Symptoms

Disclaimer: This article is for informational purposes only. Always consult your vehicle's service manual and follow safety procedures. Torque specifications vary by engine code (DV6C, DV6D, DW10).

Scenario D: Carbon Fouling without a break

If the glow plug tests fine electrically, but the code persists, you may have carbon "bridging." The mechanic must: b173d peugeot

The B173D Peugeot error code is a manufacturer-specific code that refers to a problem with the vehicle's electrical system. Specifically, it relates to a fault in the "Passenger Seat Belt Not Fastened" signal. This code is usually accompanied by a warning light on the dashboard, indicating that there's an issue with the seat belt system.

Initial Findings

Q: My scanner won’t read b173d – why? A: Generic OBD2 scanners only read engine and transmission codes (P0700 series). You need a PSA-specific scanner (Lexia 3, DiagBox, or high-end Autel/Mac Tools) that can communicate with the BSI module.

The root cause is rarely a broken engine and is usually one of these electrical "gremlins": The Peugeot fault code B173D identifies a failure

Fix 2: Replace the Air Quality Sensor (95% success rate)

The part number for the Peugeot/Citroën AQS is typically 6441.C8 or 6441.C6 (always verify with your VIN). Generic OEM brands like Valeo, Hella, or Meyle produce reliable units for half the dealer price.