Actually 66 is the most nondescript code you can pull. I also have this code right now and have found an older thread on the subject.
Ichi Ban says "most 66's are caused by failure of secondary BOV, they develop a vac leak internally (this triggers CEL when the vac tank empties out when under load) ie no engine vac
Primary BOV failure will also cause this code, and the car will only have a small amount of boost (4-5 psi normally)
Primary turbo wastegate seizing is another primary cause for 66
Some other items you need to check
Vac tank - is it still there or has some pannel beater thrown it away
Hose to vac tank - check it for leaks, often is damaged in small frontal impacts
Good luck -- The secrets are out"
Might help you too.