code p0411 and p0605

My Daughter Has A 1998 Beetle 2.0. The Check Engine Came On,a Friend Checked It And Codes P0411 and P0605< Said It Was Secondary Air Flow Injection Incorrect Flow> What Does That Mean,has Anyone Had This Problem And Waht Is The Cause,,,please Help

The P0411 SAI incorrect flow could be a number of faults w/in the system. It would be best to get a good manual to diagnose. The P0605 is worse, internal engine control module ROM failure. You'll need a new engine computer.