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Old 02-02-2012, 09:13 AM   #1
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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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