Focus Fanatics - View Single Post - oxygen sensor graph review help. Cat dead?
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Old 02-07-2012, 04:56 PM   #21
fast*st
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Join Date: Jan 2012
Fan#: 93319
Location: Groton, United States
What I Drive: 1999 F350 Dually, 03 SVT ZX3

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Also read another bulletin on the focus that a P0420 could be caused by a high oil level? I checked and yeah, its a half quart or more over the line so did an oil change. I haven't seen the P0420 re-appear yet. Getting close to the 100 miles since reset so should be good for emissions testing soon.
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