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General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.
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02-02-2012, 08:13 AM
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Focus Enthusiast
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oxygen sensor graph review help. Cat dead?
So managed to graph oxygen sensor output on the Focus SVT, cleaned the MAF, changed the PCV and trying to track down a P0420.
Red is front, green is rear, it seems like the voltage is lower on the rear but not sure if its enough. On the standard xl graph view for O2 sensor voltage, the rear is graphed on an 11 volt scale and the front is a 1 volt scale so the rear looks smooth. Any input appreciated!! 
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