Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Oxygen Sensors, OL faults, and crazy volts
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Old 01-20-2013, 09:26 AM   #5
1turbofocus
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Many things could cause this , bad o2 , blown fuse to the o2 , fuel issues etc

How old is the front o2 , have you checked the voltage to the o2 ie fuse

Tom
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