Hi!
I have an 03 Cooper s with the JCWorks Package.
Recently the emissions sensor light and the Engine Maintenance sensor light have been coming on\ together, reducing the power in the car. I have noticed that if i turn the ignition off and on again, they reset, and just the emissions light remains on, but the power is restored.
I have noticed thta this mainly happens when the fuel tank is full, and around half full.
I took it to a dealer, and they have said it requires a whole new wiring loom.
Has anyone had any similar problems??
Doe anyone have any ideas or possible solutions??! (preferably cheaper ones than the whole wiring loom!

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Grateful for any help whatsoever!!!