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  1. MK3 TSB, Recall & Problems Archive
    Hello everyone! I have a 2012 Ford Focus SEL and there’s a code (P0131) O2 sensor circuit low voltage bank 1 sensor 1. I replaced the O2 sensor (Bank 1 Sensor 1) assuming it was the problem. But the code did not go away and it did not fix the issue. The cable that connects the O2 sensor looks...
    diagnose ford focus low voltage o2 sensor p0131
  2. FocusFest Caravan
    Hey, So my girlfriends Focus has started stalling out occasionally when at low RPMs, finally pushed a code, engine too lean and bank 1 sensor 1 too lean... So i pop the hood with it idling and i can hear a vacuum leak but cant find where it is to save my life (her engine is super loud lol)...
    2006 o2 sensor
  3. DURATEC Performance (2003-2007)
    I have the PZEV 2.3L Duratec, and my check engine light is on. I had bought a cheapo cold air intake, and when I had the codes read all 3 of my O2 sensors were throwing a code. I just upgraded to the FSWerks Cool-Flo and reset everything by pulling the battery cables and what not and the light...
    cel check engine light cold air intake fswerks o2 sensor
  4. General Technical Chat
    My check-engine light has been on for quite sometime now... Since it has come on, the car has been getting much worse gas mileage. Every OBD II scan has shown codes related to the O2 sensor. So far I have... -replaced the O2 sensor twice with third-party brands -replaced the O2 sensor with...
    o2 sensor o2 sensor problem won't go out
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