Peugeot - B173d

If your Peugeot is throwing the B173D code, you can follow these steps to narrow down the issue:

Diagbox (PSA OEM Software) or high-tier OBD2 bi-directional scanners Common Symptoms of Code B173D b173d peugeot

(doors won't unlock when walking up to the car, or won't lock upon leaving). Engine cuts out shortly after starting. Active fault light on the dashboard. Top Causes for the B173D Fault If your Peugeot is throwing the B173D code,

The Peugeot BSI is the brain of the vehicle's cabin electronics, managing everything from central locking to transponder validation. Top Causes for the B173D Fault The Peugeot

The first step is always the same: write down all codes, clear them using a professional-grade diagnostic tool (e.g., Diagbox, PP2000, or equivalent), then take the vehicle for a 10-15 minute drive. Re-scan the system to see which codes return immediately. A code that returns instantly is likely a genuine, persistent fault. Codes that don’t return were likely stored as intermittent events.

The is a serious but often rectifiable immobilizer issue. While it commonly points towards a malfunctioning key fob or a poor connection in the key reader, it can occasionally signify a larger BSI module issue. Starting with the simplest solutions—changing the battery and testing a spare key—is key to saving time and money. If these do not work, seeking a diagnostic from a Peugeot specialist is recommended.