[racer_d]

For starters, you need someone/someplace with an OBDII reader. Basic ones can likely be found online. Genuine Porsche one is too much $$$ for someone other than a dealer or sucessful independant shop. A generic can get you going in the right direction of what has failed.

Once a code is read, it can be diagnosed. There are seemingly 100's of codes that can be tripped that cause the Check Engine Light to come on. Some are minor. Some are major, but you need the code and diagnosis to then fix the problem.