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On a 2000 Merc. it's usually an emissions problem. You can try a water dryer for the fuel and change the PCV valve. If the light remains on, then more than likely it's the EGR valve. Have it tested for free at autozone or Advance auto.

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โˆ™ 2005-04-01 21:41:22
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Q: Why is the check engine light on in a 2000 Mercury Mountaineer?
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