why is the check engine light keep coming on

2004 MAZDA 3
189 MILES
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SHELL6907
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I put a rebuilt motor in this car engine light keeps coming on,the machine they plug it to says insufficient cooling,replace the coolant sensor,gas cap and fan but it still says the cooling code the fluid is fine.Please what could be the problem now?
Dec 21, 2011 at 6:34 PM
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