If you can DIY you can save heaps and often get better results.
There's a very good series of videos on YouTube about it. It's really not too difficult.
https://youtu.be/jxCEdxT2_Rk?si=a5nrZAnhaeuWbhIq
And an OBD2 adapter and Forscan on a laptop and you get access to all the diagnostics etc.