B173d Peugeot -

The simplest cause. If the signal is too weak, the reader near the ignition barrel or in the cabin can't "handshake" with the key.

The remote buttons may stop working entirely. Why is it Happening? (Causes)

Essentially, the car’s central computer (the or Built-in Systems Interface) cannot verify that a valid key is being used. Because this is tied to the immobiliser system , the vehicle will often refuse to crank or start to prevent theft. Common Symptoms b173d peugeot

While a faulty key is the most obvious culprit, B173D is often a symptom of wider electrical "confusion" in the Peugeot's complex BSI system.

When B173D is active, you might notice one or more of the following: message on the dashboard. The simplest cause

It sounds simple, but a fresh CR2032 (or similar) battery fixes a significant percentage of B173D errors. After replacing it, you may need to re-sync the key by putting it in the ignition, turning to position 2, and holding the lock button for 10 seconds.

The car starts fine some days but fails others, often in cold or damp weather. Why is it Happening

Turning the key or pressing the Start button does nothing.