Last week the truck threw 121, 237, 1691 codes it also had a dead pedal and idle problems after a lot of research (probably not enough) I replaced the vp44 and the APPS (timbo), just finished the work and now it's showing the following codes 1689, 122, 121, 1691 and 237. Do Ineed to take it in and have the codes cleared or is there something else causing trouble. I cleaned the MAP sensor, but I'm thinking it needs to be replaced. I also installed an Air Dog to keep the new VP-44 safe.