In Peugeot and Citroën vehicles, the fault code specifically indicates a failure in identifying the mechanical or electronic key, or the hands-free remote control located in the reader. This body control fault is managed by the Built-in Systems Interface (BSI) , which is the central computer responsible for security and electronics. Understanding the B173D Fault
Ignoring a B173D code related to emissions can eventually lead to a . Peugeot systems are programmed to prevent the engine from starting after a certain mileage (e.g., 700 miles) if the emissions fault is not rectified, to ensure environmental compliance. To help you narrow this down, could you tell me: What model and year is your Peugeot? Are you seeing a "Non-start in X miles" warning? Do you have any other fault codes (like P20E8 or U0028)? b173d peugeot
: A low battery in the remote can prevent the immobilizer signal from being read correctly . B173D In Peugeot and Citroën vehicles, the fault
AdBlue fluid can crystallize in cold weather or if the vehicle is unused, clogging the injector and triggering this fault. ⚡ Secondary Cause: Energy Management Peugeot systems are programmed to prevent the engine
: Have your main car battery tested. If it is more than 3–5 years old, low voltage during startup can trigger B173D.
: If the battery was disconnected improperly, the BSI may "lose" the coding for the keys. Troubleshooting Steps