2002 1.8T Fault Codes?

Our engine light is on but the car seems to run fine.  A friend with a code reader came up with the following, none of which was on his code list:  16804, 17544, 17705.  Can anyone identify them?  We have had a lot of trouble recently with ignition components and have replaced plugs, coils, ignition harness.  The car has 75,000 miles.
 
Thanks.