You need someone who has a factory scanner. We have the DAS tester and Autologic
If you are in Burlingame, I believe Holland Car Care can help.. If not we can
http://www.autologic.com/en-us/pages/homeproducts/autologic-solution/mercedes-benz-diagnostics
RepairPal Certified shops can diagnose and repair your 2000 Mercedes-Benz C230. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.