Engine warning light but no code at the dealer

Jackson2964

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CX5 2013 2.2 deisel GT
I have a 2013 2.2 deisel tourer. The engine warning light displays intermittently, seems to be after a long trip in hot external temperatures (not during), and also idling but stationary for a long period (ie: no airflow) also when outside temp was very hot. Ive taken it to the dealer while the light was on and they said no codes showed up?
 
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