[SomeRandomer123]

Well, we all know the purpose of limp mode - to get you and the car to safety whilst severely limiting power to protect the engine/transmission from further damage. Excellent feature.

But how exactly does it do this? From what I've heard and understand, the turbo(s) is shutdown and the Valvetronic hardware is deactivated. We actually have traditional butterfly throttle valves but under normal operating conditions, your throttle inputs actually control the Valvetronic hardware so the butterfly valve is rendered superfluous, except in limp mode where I believe that is now operational instead. However, it is still completely electronically controlled by the ECU as there is no cable linkage (which is obviously the case for the majority of modern cars) so you can boot it but it'll barely open under limp conditions.

How else does it protect itself? Just a curiosity!

Thankfully, I've never experienced limp mode in any BMW.