Fault code B173D is a body control / airbag system diagnostic trouble code (DTC) specific to Peugeot (and other PSA group vehicles like Citroën, DS, and sometimes Opel). It indicates a malfunction within the Occupant Classification System (OCS) — specifically, the system is unable to reliably confirm the "seat occupied" status of the front passenger seat.
This code is categorized as a "Body" code, typically managed by the BSI (Built-in Systems Interface), which is the central control unit for the vehicle's electronic functions. When this fault is active, the vehicle's immobilizer system fails to recognize the authorized signal from the key fob, leading to several operational issues. Primary Symptoms: b173d peugeot
Many drivers don't notice a drastic change in drivability, but you will likely observe one or more of the following: When this fault is active, the vehicle's immobilizer
This code indicates that the vehicle's electronic control unit (ECU) or Built-in Systems Interface (BSI) is having trouble communicating with the key . Common symptoms include: When this fault is active