Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - oxygen sensor graph review help. Cat dead?
View Single Post
Old 02-03-2012, 09:30 AM   #10
fast*st
Focus Enthusiast
 
Join Date: Jan 2012
Fan#: 93319
Location: Groton, United States
What I Drive: 1999 F350 Dually, 03 SVT ZX3

Posts: 258
FF Reputation: 1 fast*st Good Standing Member
Buy-Sell-Trade Rating: (1)
Well, its worth a shot before doing anything drastic, thanks for looking it over! The rear sensor had zero output before I started troubleshooting, that was replaced, the front is original with 95k miles on it. Hopefully the cat is happy. Oddly enough, after a drive to warm it all up, at idle, the rear sensor smooths out quite a bit but not while driving.

So O2S11 (sensor 1 front?) is just a tick higher in voltage from O2S12 (sensor 2 rear?) A newer front sensor would increase the voltage and put it closer to happyland? its an easy parts swap so I'll try to knock that off today. Today shows a P0420 in pending status
fast*st is offline  
    Reply With Quote