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Hi guy, my car is 2021 GLA 45. Driver side of exhaust emitted hot air/steam. But the other side having cold air/ normal temp air. This happened when they car is on sports plus mode. I notice that the valve doesn’t open when it is on comfort or sport mode. Does anyone have any ideas why one side had cold air flow
 

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Presumably the auxiliary sport exhaust flap is not opening on one side upon wide open throttle? They are typically spring fail-closed so it would seem to indicate a failure of one mechanism not energizing (if the spring were detached the flap should rather remain open). As a 2021 you're of course under warranty and should have the dealership diagnose and resolve.

related (older model): Exhaust flap motor actuator
 
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