Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - oxygen sensor graph review help. Cat dead?
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Old 02-06-2012, 10:17 PM   #20
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Well replaced the front 02 sensor, it was about 90% jet carbon black. Also changed the pcv valve and inspected the rubber hoses, all seemed fine. Here is another strip chart, front sensor voltage is indeed a bit higher, scale is 0 to 1 volt.

Is the Focus SVT converter really 2 parts? It looks like Header, o2 sensor, oval cat segment, rear o2 sensor, then another bendy oval cat section before it bends up and around the axle.

I have seen the P0420 come and go once since
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