1994 Mercedes-Benz Mercedes Benz Sl Class "error code 019" Questions

error code on dash display Volvo V50 2004 "engine system service required" on dash, reappears 10s after deleted, hold trip reset 20 sec and "019" appears, anyone know what this means??? Take the ...

...error. So, anyone else out there own a 2005 Lacrosse or have any idea what's up with this lemon of a car??? Additional Details - The dealer has looked over the fuel system; I've added fuel injector ...