Question about 2001 Hyundai Santa Fe

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I have a 2001 Santa Fe and the Engine light is lit and has been for many years. When I took the vehicle for the State Inspection I was told that the Co2 needed to be changed so the light would come off and I could pass the state test. But two months ago I had the complete coil pack put into the car shouldn't the computer light have turned off at that time? Or is the CO2 pack something different?

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I have a 2001 Santa fe that i bought last year and about 2 hrs after leaving the lot the check engine light came on. I have a scan tool that reads OBDII codes and found P0421. I replaced both O2 sensors cleared the code. Car ran with no light for awhile then came back on. I took the car to the dealer and they told me the O2 sensors needed replaced. I told them I had replaced them already and they said they probably came defective. The dealer replaced them cleared the code, (very expensive)and the light came back on.Back to dealer they called manufacture and they said on some Santa fe's the mass air flow sensors are bad.The dealer replaced (again expensive,fortinitly dealer replaced at their expense $460+).Light stayed off (1 yr) until a week ago and now have same code. Not sure if this time the cat could be bad (137000 miles on car) or same mass air flow problem.

Posted on Jun 26, 2009

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Was it co2 or o2 sensor? if o2 sensor is different, it is mounted on the exhaust.

Posted on Jun 25, 2009

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After you replace the defective part(s), or sensor(s), you must have the computer codes reset. You will never pass a state inspection with a check engine light on. Your local autozone store will scan your computer for you for free. After you get the codes and replace the defective parts, autozone will again scan and reset the computer for free.

Posted on Jun 25, 2009

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The best thing to do is go to Auto Zone and get your Hyundai scanned for a DTC code. That would tell us which O2 sensor has gone bad. You have three O2 sensors and one of them has gone bad, the O2 sensor sends signals to the ecm to control the air fuel mixture so it will not run to rich or to lean which is causing you to fail the state inspection. Good luck and keep me posted on what the DTC codes are, be glad to help.

Posted on Jun 25, 2009

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Parts: I assume you have the 2.7 litre engine
I priced the parts at this website:

Santa Fe , Air intake temp sensor, 2.7l $11.28
Santa Fe , Purge valve - 2.7 l $27.56

The air temp sensor is behind the intake surge tank. I do not have a picture of the sensor by itself.


The purge valve is under the car by the driveshaft and looks like this


I do not have specific instructions for replacing these parts, but I think the temperature sensor unscrews. You may want to use a little teflon tape on the new sensor to seal the threads.

For the purge sensor, remove the vapor hoses and unclamp it from the bracket.

For each sensor, the connector will have a tab you have to press to get the connector off of the part.

Let me know if you get stuck or have more questions.

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