K12 2005 Auto 1.3 ECU Unit

Hi,
does anyone know how to find out the exact part number for a 3 door automatic Micra SE, 54 reg, made Feb 2005. It's 1.3 (1240cc I think) and I don't have access to the car at the moment and probably wouldn't find my way around inside anyway. The mechanic said it'll cost an arm and a leg unless I can pick one up for cheap somewhere so I'm going searching.
Is there one specific one I need or are there a few different ones that will fit. Any help will be really appreciated as I need to get onto this ASAP.
Thanks a lot
 
I don´t know how is the procedure about the ECU in UK or Japan but in EE UU your must return to the factory or part sales market the bad and used ECU cause it fit only to your car not other, to be repaired or be changed for one new, it must have a serial number and a code bar.
 
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