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o2 sensor

  1. 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)...
  2. 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...
  3. 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...
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