I found the Ambient Air Temp Sensor! 2008 ProStar...

[Starlight]

(04-26-2017 )Brock Wrote:  Let me dumb this up a bit....

Are you saying the outside air temp sensor.... the one that shows on your dash how hot it is outside, is also tied into how the engine runs?

Yes sir. I know a local guy with a 2013 kw that ran fine and with no warning and engine lamps on derated on him. Being under warranty at the time he took it to kw and all they found was a defective ambient air temp sensor in his mirror. They replaced it and the derate disappeared. Gotta love that.