2007 4.6 p0420 ?

Question

after the mil came on , i scanned the truck and pulled the freeze frame data. there are a couple of unusual pids that showed up . in the fuel trim section there is a st ftrm 3 and a st ftrm 4. theese values are at 100 % what are they refering to

Answer 1

Hi there,

This is the calculated fuel mixture. Being at 100% means the fuel mixture is good. Likely the bank 1 converter will need to be replaced to resolve the issue to be honest.