Hey guys! I'm brand spanking new to cars and this site. I have a 2012 1.4 tfsi audi A3 that started giving me problems by constantly killing my spark plugs. The issue was eventually was found to be some leaking water cooling component and was resolved by bosch mechanics. Since then, my turbo won't boost, my car limits at 4000 rpm, there's no smoke emitted, my battery (less than 6 months old) has to be boosted every day, EPC and engine light constantly on and I'm livid with the mechanics. Can anyone tell me what could be the issue?