Audi A4 Check Engine Light

[Bashy1]

Hi,i hope it is OK to post this here. I have a 2015 audi A4 SE Ultra Tecknik and the check engine light came on. I took it to the mechanic and he said there was dirt in the throttle housing and he cleaned it out and added a fuel additive to it. He said that MIGHT do it. I left the garage and an hour later it came on again. Took it back to him and he said that the computer said that secondary pump for the coolant need to be replaced. So it wants me to bring it back to him. I gave him €150 for cleaning the throttle housing and the additive and now I feel that the issue should be sorted and I shouldn't have to keep going back. I'm conscious that as a female the could be taking advantage of the fact that I don't know much about cars. I watched a video on how to clean the throttle housing and it doesn't seem like a job that should cost that much.

So cam someone who knows more about things give me some advice? Does it sound like he's making a meal out of it and trying to get as much money as possible from me?

Thanks