Looking for some advice.
My friend has a 56 plate Mini Cooper.
When driving the ECU light is coming on and power drops.
Showing DTC light also, problem is still there when you switch DTC off.
Switching off engine resets the problem, but recurring every 5 miles or so.
It has been into BMW dealership for diagnostics and showing no faults.
They have replace throttle housing, battery then they said it was Ł1500 for ECU. Just fitted one from ECU doctor and fault is still there.
Becoming tedious and expensive giving it to BMW for trial and error problem solving.
Thanks in advance