2009 Cooper oil pressure indicator

[paulh2602601]

Greetings, everyone. I purchased a Cooper S with this defect. The apparent pressure sensor has been installed by a garage, suggesting it is an authentic sensor. Nevertheless, the light illuminates. No fault codes are associated with the issue; only the footwell module requires reprogramming. The battery was completely depleted.
It initiates on the first attempt and operates well at idle. The light activates once the engine has reached optimal temperature.
My inquiry is regarding the initial steps for inspection and replacement. ???


Thank you in advance.

[paulh2602601]

[coolguy]

The oil pressure light is unrelated to those codes, in my opinion. It is necessary to utilise a wet oil pressure gauge to ascertain the real-time pressure. It is common for an engine to exhibit oil pressure when cold, but as it warms up, the pressure may drop to zero, triggering the warning light. Likely causes include significant wear in the cylinder head where the camshafts are located, any grooves indicating irreparable damage, and potential crankshaft damage. To assess this, remove the sump and inspect the bottom surface; any grey colouration suggests that the crankshaft is compromised.

[paulh2602601]

Thank you for your response. I anticipated that you would. I recognised that the codes were unrelated, yet I felt compelled to disclose them.
It appears that I will be undertaking one of your rebuilds, which I find rather agreeable, to be candid. Any recommendations regarding which components to get would be much valued. This mini is too valuable to damage, and my objective is to maintain these minis in operational condition. It has only completed 80,000 kilometres.