B173d — Peugeot __exclusive__

The control unit (a small black or silver box mounted on the rocker cover or near the injectors) is a solid-state relay. It can fail for cylinder #4 only. If the MOSFET (transistor) controlling Cylinder 4 burns out, you will get a B173D code even with a perfect glow plug and wiring.

Fault code on a Peugeot indicates an "Error identifying the mechanical/electronic key or hands-free remote control" . This means your car's Built-in Systems Interface (BSI) or Body Control Module is struggling to recognize the signal from your key or transponder. b173d peugeot

Use a diagnostic tool (such as ,

An "Electronic Anti-theft Fault" or "Economy Mode Active" message appearing on the dashboard. The control unit (a small black or silver