When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
My friends' 450 7.3 check engine light comes on when going up hill or pulling a trailer. The code is showing P 12 11 from what he tells me. Is this an IPR issue? I haven't had a chance to run a test myself but it seems that is the IPR code?