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No worries. It's just that the 'gone into km' mode problem seems to be the most common one, especially after the battery has been disconnected.
This one's not unheard of though, and I had it happen on a Lag I once. The dealer told me it needed a new instrument panel, but the next owner got it sorted by another dealer for their minimum diagnostic and labour charge.
If you're very lucky, it might just clear if you do a dash diagnostic, though I think when I last suggested that, it didn't work. Anyway, nothing ventured, nothing gained.
Hold down the button on the end of the wiper stalk while inserting the keycard. The dials on the dash will start to step up and down and most of the warning lights will come on.
Step through with the wiper stalk button until you see either a series of four dashes or a mixture of dashes and letters on the mileage display.
Press the trip reset button on the dash, and the dash should go back to normal.
If you're very lucky, your fuel functions will have come back. You'll probably have to drive the car for a mile or so before knowing for sure though. If not, you'll have to find a dealer or Renault specialist who'll agree that they can sort it without replacing the whole panel.
Currently in Horatio's garage:
2010 Laguna III Initiale.