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DAVE 7/11/2010
2004 Ford Freestar SE 6Cyl3.9L - Engine
HOW DO YOU REPLACE HO2S11
1 Answer
  • JunkFixer
    JunkFixer 7/11/2010
    HO2S B1S1 is the frt sensor on the rear cyl bank. Access is difficult. You will need a short O2 sensor socket (Rotunda P/N 303-476, FoMoCo T94P-9472-A) and a little practice standing on your head. The engine will need to be cool.
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