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 02-02-2012, 09:26 PM   #6
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)
Thanks, the graph is from scanxl pro the voltage is 0 volts at the bottom, 1 volt at the top. The rear 02 sensor had failed and that is the new one, old one had o2 heater failure and no output. So there seems to be 2 schools, on a full dual cat system the rear is a flatline and the front is the cyclic pattern. On the smaller single cat they can both oscillate with the rear being of lower amplitude from the front. I'm just not sure what the correct SVT pattern is. Red is the front sensor, yellow is the rear.
fast*st is offline  
    Reply With Quote