Few days ago a problem appeared on my Focus
Both motor and car speed indicators drop to zero, LCD mileage indicator shows dash lines (------) instead of kilometers and a second after the orange motor pilot lamp lit. Then a few seconds or minutes later indicators kick back to normal and the problem disappears.
I don't feel any influence on engine behaviour and the failure seems absolutely random not depending on engine or car speed or any electrical device switching.
Sometimes other pilot lamps lit (e.g. battery).
Ford Service made already a computer check while the problem was not present (no luck) and ddn't find any fault. The only logged alarm was "positive of fuel indicator level sensor shorted to ground" but the fuel indicator is the only which never drops during the failure.
Has anybody as an idea about this strange problem?
Gian Piero