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-   -   P0420 o2 sensor... (http://www.focusfanatics.com/forum/mk1-focus/303801-p0420-o2-sensor.html)

zjohnson 12-06-2012 01:06 PM

P0420 o2 sensor...
 
Had a check engine light, replaced the o2 sensor about 400 miles ago, replaced spark plugs and reset it. Came back on, I was thinking maybe catalytic converter?


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