OBD trouble code 16 what does it mean?

Hello
I need help understanding a code 16 readout from my OBD.
The check engine light comes on every once an a while with a code 16.
I clear the OBD by holding the readout down for 6 secs and all is fine until the next time (weeks or months). Can you help?
Please email using reply option........

Best regards
Ed Lang

[Behind the Star]

Closed Throttle Position Information Defective.
That is for a 94 E320. Yours may be different. What car do you have?
Brian

Thanks for the help Brian. I have a 92 300e. Is there any listing of all the codes for this car?
Ed

[Behind the Star]

EGR switchover valve Y27
Hope that helps.
Brian