As above. It'll most likely be wiring or connector related.

Just out of interest, if you scroll through the trips on the dash with the select button, are there three trips, or two? If there are the two normal trips and a third (the 'F-Trip' - Kms since reserve level was reached) and the light is on then it'll almost certainly be a sender problem in the tank.

Either way, it shouldn't be a deal breaker as the fuel light tells lies anyway and shouldn't ever be relied upon!

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