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My Check engine light came on recently in my 2006 Cayenne (Base).  I hooked up the Durametric and engine fault code P1120 showed up.  It says:

 

P1120

- No signal/communication, test conditions are not-completed, fault is currently active and causing a DTC light

 

I cleared it and it came back 2 days later, same error.  I've done a fair amount of searching but have not seen many solid common resolutions.  Does anyone know a way for me to check some wires for corrosion/fraying (i.e. where would I look?), or should I proceed with the throttle body cleaning (the latter showd up a few times as a possible cause)?  I recently had a fair amount of electrical re-wiring completed due to corroded wires and a faulty relay under the driver seat.

 

The car seems to run fine, but I'm worried ignoring this will be expensive later!  Any help is appreciated.  BTW - I love this site and this is my first post.

 

Thanks,

Dave

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Welcome to RennTech :welcome:

 

P1120 is a signal interruption in the egas throttle control system.  Possible candidates are the wiring (assuming a break or ground condition), or the throttle position sensor itself. I would Make sure the throttle valve connectors are secure and clean. Check for cuts or other damage. Reset the codes and see if they come back.

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