Check engine light and trouble code help??

[nobody_u_know]

2005 F-250 6.0
MBRP Straight pipe
SCT Livewire


I had my Alternator go out on me yesterday and replaced it. Also replaced the belt while I was there.

Now I start my truck and the check engine light comes on. When I use the Livewire to read the code it gives me P0472 - Exhaust Pressure Sensor Low I clear the code but it comes right back next time I start the truck.

Not sure what could have caused this, and don't understand what that trouble code means. I didn't have the problem until I changed Alternator and belt.

Any help with letting me know what to check and where to begin would be great, Thanks guys.....

[nobody_u_know]

Looked around on the computer for a bit, found the sensor. It was just not quite plugged in all the way, must have bumped it when changing that belt.

Thanks though guys.