Thread: Tuners Help
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Old 06-19-2013, 11:04 PM   #9
2nd Gear Member
Join Date: Oct 2011
Vehicle: 2012, Ford, Mustang GT
Location: MD
Posts: 443

All four of the O2s are wideband. I had a failed O2 on my DS downstream and it would cough and sputter until I replaced it.

With both upstream and downstream O2's on and NO cats, they are reading the exact same thing, so the ECU thinks that the Cats are bad and tosses the CEL and puts the car into a sort of 'limp mode'. The up and down stream O2's are not supposed to read the same thing, if they did (on an unmodified car) it would mean that the cats have failed.

"Scarlette":2012 GT 5.0, 6spd man, Brembos, 3.73, RACERED/Black, Deleted stock mufflers.
12.959 @ 110.9 (Oct 7, 2011)

"Brisco": 2000 F-350 XLT 7.3L Powerstoke, 6spd man, Crewcab/LB, 4wd, so many performance mods I've forgotten 'em all. Down for the count. NO BRAKES and NO CLUTCH!
16.149 @ 84mph (in 2007/7800lbs)
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