MarkX control unit communication error

Sounds frustrating! I had a similar gremlin with my old Renault Megane. Check engine light, weird sensor readings... turned out to be a corroded connector causing all sorts of chaos. It's like a bad phone line – data gets garbled and the whole system freaks out!

Corroded connector you say? Where exactly was the issue on your Megane?

On the Megane, it was the data link connector under the dash. Get a car diagnostics ran, it sounds like a wiring issue causing the communication breakdown, like a short circuit. At this point I would take it to your local workshop.

Thanks, I appreciate the insight. It was indeed a defective plug. Got it repaired for 95€.