After car sits overnight this message appears as a text warning with no warning light on the dash. Could this be a sign of a failing battery. I have had the car checked out by auto spark with all the fancy Snap-on vw software. Only one message of Low volts 11.8V, the car starts perfectly every morning. I am assuming the ECU monitors volts continually.
If it was a fault in the pressure sensor would the message remain "on" all the time. I disappears once car starts and even when stopping after about 12 mile commute. Although when car sits for 9 hrs the message appears on first before starting the car.
ESP/ABS fault warning message
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