Comon Rail Trouble Codes Questions

[Red Stroke]

Codes off 2004 CTD

2122 pedal position sensor circuit low

2121 APP sensor volts do not agree with idle validation siginal

Anyone have any insight on what parts to throw at this?

I am a 12V man and don't have to mess with codes that often.

 

[bdp]

More then likely its gonna need a APPS.

 

[Red Stroke]

Thanks for the reply, thats what I have been hearing as well. Hope thats what it is since they are around $350.