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B173d Peugeot -

B173D

The fault code in Peugeot and Citroën vehicles is a diagnostic trouble code (DTC) typically related to the immobilizer system or key recognition . What the Code B173D Means

Peugeot Warning Lights: Dashboard Symbols, Meanings & Next Steps b173d peugeot

BSI (Built-in Systems Interface)

In Peugeot and Citroën (PSA Group) vehicles, the acts as the vehicle's "brain" or central gateway. It controls the body electronics (lights, locks, wipers, dashboard) and communicates with the Engine ECU and Transmission ECU. B173D The fault code in Peugeot and Citroën

An interrupted update of the firmware (often done via OTA or a dealer diagnostic tool) can cause a mismatch between the software versions of the ECU and BSI. Infinity (OL): Bad glow plug

1. Battery Replacement (Most Common)

  • Infinity (OL): Bad glow plug.
  • 0.0 Ohms: Short circuit (also bad).
  • 3+ Ohms: High resistance (plug is dying or carbon-fouled).
  1. Persistent Check Engine or Service Light: The amber engine/Service light illuminates and stays on. In some models, a message like "Air Quality Fault" appears on the central display.
  2. Manual Recirculation Only: You can manually press the recirculation button, but the car never switches to recirc automatically, even behind a smoky truck.
  3. Musty or External Smells Entering Cabin: Since the system fails to close the fresh air flap, exhaust fumes, dust, and odors enter the cabin freely.
  4. Error Code Storage: The fault is stored in the BSI. If cleared, it often returns immediately or within one driving cycle.
  5. Potential Parasitic Battery Drain (rare): If the sensor has internally shorted, it can keep the BSI network active, slowly draining the battery overnight.