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Nissan Micra K12 . Ecu won’t talk to garage computer

2004 Nissan Micra K12 . Ecu won’t talk to computer. PS not working, will only run up to 3500 rpm or 20mph which ever is the easiest to attain. Fuses are good. I blew the 80Amp fuse on the positive battery terminal. Getting codes p1122 and p1126. Check engine icon will not reset. I’m thinking I need to replace ECU? Can I just replace it and will it relearn the car itself? I replaced throttle body also
 
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