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Fuel figures suddenly drop

Tony673
Tony673
in Ford Mondeo / Vignale Club

Featured Replies

Hi all,

Up until about two weeks ago I was consistantly getting 49 mpg, but one day the insrument display suddenly flipped over to zero miles on the trip counter and temperature changed to F instead of C. From that point I am now getting 44 mpg. My driving habbits have not changed and the car doesn't seem to be running any different so I'm wondering if I might have an ecu glitch and if it's worthwhile resetting it.

Any suggestions or advice.

Tony

  • Quote


    If the temperature changed from C to F then maybe everything has reverted to American units. A US Gallon is smaller than a UK one.

    I have no idea how you can reset it other than possibly with FORScan and an Extended Licence. 

  • Quote

    Two possibilities, the car has either pre-prepared itself for when we leave the EU or it has been nobbled by Trump. 😕

    Seriously though, Tizer could well be correct. Has there been any interruption of power to the ECU?

  • Quote
    • Haha 1

    Did you accidentally press the reset button to the left of the rev counter maybe?  That should switch between C & F.

  • Quote
    • Author

    I have decided to reset the ecu (diss battery and short leads) and now all seems fine with 49 mpg after a 20 mile run around town, so I can only assume that the ecu had a momentary power dip. I will keep a close watch for any future glitches though.

    Thanks for the input.

    Tony

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