Skoda Octavia Elegance TDI 2 litre year 2008 mileage about 90,000.
Normal behaviour: ignition on, display in centre of dash flashes the top part (mpg figures etc) for a few seconds. If radio is on, centre console display shows outside temperature (today 13.5 degrees).
The lower part of the display flashes a spanner symbol.
If I wait many seconds, the lower part of the display shows the trip miles.
Whatever, I start the engine and drive off.
Yesterday and today, after 2 miles there is a "ding" sound. (The same ding as the indicator warning when parked.) The top part of the display in centre of dash flashes for a few seconds then shows the expected information, and the centre console shows a ridiculous outside temperature like minus 2.5 degrees.
Over the next ten minutes the outside temperature drifts up to what I expect it to show.
Two days ago I did drive through some serious puddles - floods several inches deep - so perhaps water has got somewehre it should not?
Is this an indication of a more serious failure about to happen?