I show code 9 as being -- intake air temp sensor-open or short circuit-- not sure if this is the same as what amg280 describes or not. Check the sensor to make sure it is plugged in securely.

http://www.batauto.com/MB/

Good luck!

__________________
-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi