ok after a few weeks after my y-pipe install i got an Cel and so i ran the code

01-15 Fuel INJ Sys Right bank:lean

now what is causing this? is it a bad O2 sensor or bad gas? and why only the right bank. assuming that is the side nearest the firewall.

i reset the ecu and it hasnt come back yet but it has only been a day so i am expecting the code back soon


Thanks