I have a 2002 audi a4 1.8 t and have some problems..I just put 1500 dollars into just so it would pass inspection.they replaced the speed sensor and that's it..check engine light still comes on...I have an after market afe cold air intake , apr stage 1 divertor valve, and custom exhaust...mechanic said turbo might go...would it be worth getting it tuned to fixed the problem??? I need help or else my dads going to sell it and I love my car!!