OBD2 codes
 

I have a 1997 Civic EX and recently my check engine light came on. My mechanic downloaded the code, "P.O. 1259 - VTEC malfunction", but told me that it was undocumented in his manual. The engine seems to be running fine, but I am concerned about driving it until I learn what this code means. I would appreciate any asistance on this matter.