Hi my cooper s eml is on in the speedo dial on my way home another eml came on in the centre of my rev counter dial and I lost all power from my supercharger about five minutes later power resumed

Hi. Thanks for your question. For assistance on speedometer of 2008 1 series 116i insruments you can visit https://www.reliable-store.com and download the entire workshop manual which includes all the information along with the diagrams for better understanding. Good day!

misfires are also caused by low fuel pressure injector electronics faults and faulty injector tips . Replacing plugs is half the fix

I have a similar problems on my 2005 9-3. It has developed a number of minor electical issues. including dial and false warning light triggers. I have fixed most of them by simply going round the car disconnecting the electical connectors and spraying "switch cleaner" (Maplin or Radio Shack).
The only problem I have left is the rev counter occasionally starts reading high, removing the fuse (end of dash panel - 4th fuse down) for about 30s with engine off normally resets everything back to normal.
Hope that helps.

Does the car crank over or does it act like maybe the battery went dead?

could be needing replace best to check with the main dealer

Low battery, check your battery

my power steering light comes on and off, and the car will not switch on once turned off, its draining the battery??

HAVE YOU TRIED DISCONNECTING THE BATTERY & RECONNECTING THE BATTERY THIS SHOULD RESET REV COUNTER.

the engine control unit has detected a fault light illuminated which in turn reduces ability to gain high revs as a damage limitation exercise , known as limp home , car requires diagnostic computer to check fault codes to indicate faulty component causing ecu to go into limp home mode

Try reading the obd2 code with your phone and this cheap device