The only thing I can guess is that you've warped the plastic body of the SOV by putting the o-ring in the wrong spot. This may be putting the internal mechanism in a bind.

Have you put everything back the way it belongs? If so, it will take 3 cycles of starting the engine cold, warming to operating temp and then shutting off and returning to cold in order to clear the codes.

Of course, you can also clear them manually if you have a scanner.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250