Euro 5/6 Pass Thru in the wild … an advantage or just window dressing to comply to regulation?

A workshop replaced the complete air suspension system in a Peugeot Boxer 2.2 HDi and asked if we could perform the adaption procedure. “Of course!” we said, “Bring it over, we have Peugeot Pass Thru up and running!“. Day 1 The Peugeot Boxer comes in. We fire up DiagBox (*). The first thing it tells us to do is connect a PR9780.X4 cable between our Pass Thru device and the…