Got a bmw 335xi

I picked up this 2007 BMW 335XI for $2,995 with 178,000 miles it runs pretty good however I did notice it has its tweaks and I need some guidance, first of all I am getting a low coolant symbol even though I just did a full flush on it and filled it all the way up maybe a sensor? And second when I do mash the pedal like pretty hard it gives me a ccid-29 but there’s no sputtering or indication that the engine is really struggling what could be causing the ccid-29 any ideas? Otherwise like I said it drives very well and the engine seems really healthy.