Had this on another part of the forums and over 100 views but no answer. How do you know when it is time to change these. Recently at a tuner shop and after a computer scan/diagnostic said that i had a bad front O2 sensor that was stuck in lean position causing an erratic idle.

My FPR hose is already sealed in place and clamped so thats not the problem. I recently got the timing chain, guide and tensioner replaced with the stronger revisions so thats not the case.

Gott a cobb accessport v3 and that has helped a little but i see that they say to get and upgraded fuel pump relay (the blue one) and i am getting that.

Said my voltage readings for the front were less than 1 volt and that it should read at least that or higher.

Any help is greatly appreciated!