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  1. B

    Help

    I have taken it to O' Reilly's and had them clear it. It's good for a while and then it pops back on. That's why I'm thinkin'...is it a reset of the computer by unhooking the battery? or is it an exhaust issue? (Catalytic converter?) or something else...
  2. B

    Help

    I bought a 1997 Ford Explorer XLT about 7 months ago. I love it! It has the 4.0 and runs like a champ. Recently the "check engine" light popped on. I took it to get checked and it showed the downstream o2 sensor went out. I replaced it. It still pops on. Someone said to unhook your battery to...
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