Ditto happened to mine about a week ago.

Ran a diagnostics on the car all clear.

It disappeared after turning the engine off and on again.

We had a 43C day here in Melbourne Australia so that might have upset the X a bit.

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Cheers Andy
From Down under

2004 4.4i Sport Alpine White
2008 Toyota Land Cruiser Turbo Diesel (on order)
1993 Daihatsu Feroza SXP II