In the context of Peugeot and Citroën (PSA Group) vehicles, the fault code is a diagnostic trouble code (DTC) that signifies a failure in identifying the mechanical or electronic key, or the remote control. Understanding Fault Code B173D
because the immobilizer keeps the fuel system or starter locked. b173d peugeot
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. In the context of Peugeot and Citroën (PSA
This code is common across PSA Group vehicles (Peugeot and Citroën) and generally prevents the engine from starting because the security system does not "see" a valid key. The car will not start or crank. It can fail for cylinder #4 only
It seems you are asking for a review of the — however, no production Peugeot car model is named B173D .