Mini Cooper Diesel Cylinder Pressure Issue

That sounds remarkably similar to a problem I encountered with my Mini Cooper some time ago. I recall experiencing diminished engine power and a disconcerting increase in fuel consumption. Has the check engine light illuminated on your dashboard, perchance? Did you check the spark plugs?

Indeed, the check engine light did illuminate, which added to my concern. Spark plugs seem fine, but can you elaborate on the specifics of your experience? Any details regarding potential root causes or diagnostic procedures would be greatly appreciated. Was the turbocharger involved? Did you measure the cylinder pressure at all?

In my case, the fluctuating cylinder pressure was indeed a secondary symptom. The root cause was a malfunctioning sensor related to the turbocharger. I would advise a thorough diagnostic check before assuming the worst. I remember that the issue was difficult to diagnose, so I would recommend going to a workshop.

I must express my sincere gratitude for your input. You have provided invaluable insights, and I can now confirm that the issue has been resolved. It turned out that the fluctuation in cylinder pressure was indeed a consequential error, stemming from a faulty sensor in the turbocharger system. Replacing it rectified the problem entirely, resulting in a repair cost of precisely 0€. I was fearing the worst: issues with the crankshaft, fuel injector or engine knocking. Thank you for pointing me in the right direction!