Unfortunately, the hidden menu goes back to being hidden after the car is turned off. So the hidden menu access is only practical for infrequent checks. If you want easier access for freqent engine temperature checks, use Carly or Torque or a similar item.

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Stephen
2010 e70 35d- now driven by son #2
2005 e53 3.0 - now driven by son #1
2021 G05 45e PHEV - now driven by me
2008 ML320 CDI - driven by wife