High idle on 2002 santa fe

The item in question is call Idle Air Control (IAC).
This unit function is to do fine idle trimming at idle.
IAC is located near the end of the accelerator cable.
It move internally with a worm gear to adjust idle.

You will need a friend to friend to test IAC.
Start engine and turn on all electrical items.
HIGH BEAM,AC,RADIO,ALL FANS,SUNROOF to max out the drain.
Carefully listen for movement at IAC.

Check for cable disconnection / damage at IAC.

check the cayalytic check the temperature before and after of the CAT this two temp. need read same or closer if the temp. after the CAT is more high you need replace.

My 2005 Hyundai Santa Fe is a 17mm. I also made a video showing how to change the oil.

I had the similar problem with my 02 santa fe. Someone said it is the crankshaft sensor. How is yours now?

neither have i to be honest ,i change oil filter every third oil change on my regular customers cars with a oil change every 6000km or so ,never a problem and i have often changed a filter on some cars without changing teh oil where the metal cannister has started leaking

on the 2.7 the fuel pressure regulater is prone to leaking, worth checking it out

I faulty Idle Air Control valve (IAC) can cause these specific symptoms. You could try diconnecting the IAC valve (usually near the throttle body) and regulating the idle yourself. If the fluctuations go away and you are able to hold a constant idle position with the gas pedal (if vehicle will start), the IAC is the problem.

Take it back & tell them to FIX it.

Lift your Hyundai Santa Fe using a jack and then place the car on jack stands. If you don't have jack stands, drive the car onto a set of wheel ramps.
Pop the hood and remove the dipstick and oil filler cap. The dipstick is near the front engine compartment with the oil filler nearby.
Gather an oil drip pan, a 17-mm wrench, oil filter wrench, cleaning cloths and a new oil filter. Slide under your Santa Fe.

Change the Oil

• Locate the oil filter and oil drain plug underneath the car. The drain plug is on the bottom of the oil pan, and the filter is to the side of the oil pan.
• Remove the oil drain plug using the 17mm wrench. Pull the plug out quickly and let the oil drain for 10 to 15 minutes. Check the gaskets and threads for damage. Replace these components, if necessary.
• Take off the oil filter using an oil filter wrench. Dump the old oil into the oil drip pan and put on the new oil filter. Tighten the oil filter by hand, and then replace the oil drain plug using the wrench. Clean off the excess oil.
• Go under the hood and add oil. Turn on the engine and check the oil pressure gauge to make sure it rises. Let your Santa Fe run for a minute.
• Lower your Hyundai Santa Fe and turn off the engine. Take an oil reading on the dipstick. If the oil level isn't at full, add a bit more oil.

Thanks
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Check air filter. Has your driving habits changed? Or......It's unlikely but people do do it......gas theft. With prices high, people are taking a hose to steal gas from random vechiles. No bull. Try parking your vechile inside locked building, to see if that helps. If so, well, you got your soultion.