I gave my BMW car to Casey Automotive when I was having some issues. They initially said they needed to repair the spark plug, and they did fix it. It cost about $1700. I'm not totally sure if it is fully resolved though because the engine light still goes on and off. I'm not sure when to take it back because the light is only on intermittently. I will definitely be taking it back to them within the next week or so and they can see what else might be going on. They are professional and seemed like they did good work.