While I was working on this, I tried to inspect the
Update: apparently that wasn't the knock sensor, but the sensor that controls the coolant fan. The connectors are nearly identical though...
It's surprising how bristle that connector is, knowing it's subjected to temperatures between -30 and +100 or even more, water, grime, etc.
New connector, knock sensor and knock sensor module (ESC) are on their way. Due to the transport costs from the US to Europe, it's always cheaper to order more parts at once.