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I have a 2005 d4D Lc3 and the economy meter built into the radio is not working. The radio works perfectly and the car performs as expected. Can anyone help me with finding a cause and possible cure??? Or at least point me in the right direction. I'm a retired Toyoda engineer so am able to cope with most things but this seems lack info to fault find, seems that the multifuction unit is well catered for but not the much more basic unit.