What year is it ? As per Jimbob all should be green. Has it not been driven for a while or exceptionally cold weather conditions atm ?
Mine sits in the garage for long periods during winter & more often than not throws low pressure warnings. I changed from compressed air (regular stuff you get at the garage) to nitrogen filled which fixed the problem. You may have a puncture but highly unlikely in all 4 tyres. Pump them up & keep an eye on things.
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