Question about 2000 Mazda 626

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I have a 1996 Mazda 626, the check engine light came on and the car has been redlining the the temp gauge. I got the engine codes which are: p0117 and p0421. Does anyone know how to solve this problem? Code p0117 comes up as "Engine Coolant Temperature Circuit Low Input" and p0421 comes up as "Warm Up Catalyst Efficiency Below Threshold (Bank 1)." I checked my relay for the cooling fan and it's not reading anything, could this be the solution?

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  • Mike Butler
    Mike Butler May 11, 2010

    If Rad fan not coming on when engine gets to normal operating range, either the coolant temperature sensor is faulty, or probably the relay. Is it a 4 cyl or 6?

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The cooling fan must run or the car must be running into the wind to keep from cooking the engine. Physically turn the fan to see if it turns freely (cold engine). The computer reads coolant temperature and trips the fan relay on when normal temperature is reached. You need to read the control voltage at the relay to determine the problem. Possible bad temp sensor.

Posted on Jul 15, 2009

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SOURCE: Mazda MPV 2003, Engine light on, code P0421 - warm

could anyone please help me with this problem that i have with my 2001 mazda protege es 2.0. i have a bad catalyst converter and im waiting for the converter to come in, but before the guys that are fixing on my car relize that i need a converter they put a egr valve and a o2 senor and when the car idle some time it will just die one me. could someone tell me what is going on.

Posted on Dec 24, 2010

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