Greg36
Newbie
I have a 454 Vortec and it was throwing a code P0401 “Exhaust gas recirculation flow insufficient” and P0410 Secondary air injection system” I clean the EGR valve and made sure the EGR port wasn’t clogged with carbon... did not solve my problem. The u threw a new EGR on to make sure. Wasn’t it. then I Replace the map sensor because I thought I damaged it when I cleaning my throttlebody and now my truck runs like crap doesn’t idle right and is still throwing the P0401 and P0410 codes and now with an additional running lean codes p0171 and p0174. Any lnoledge would be greatly appreciated thank you