2001 Hyundai Santa Fe

Engine Performance problem
2001 Hyundai Santa Fe 6 cyl Two Wheel Drive Automatic 95,000 miles

My 2001 Hyundai Santa Fe will increas itle to about 1900 RPMs about 10 min after starting and driving normally. If I stop and then take off it is slugginsh at first. Used a friend's OBD2 reader and got P1529 and P0115. These dont seem to match the problem i'm having. However I did notice that both cooling fans come on about 1 to 2 minutes before the idle problem starts even when it seems too cold out for them to be running. The engine temp guage on the dash reads normal temp. If I clear the codes they will come back the next time the idel problem returens (the very next time I drive it). This one seems tough and i'm sure it'll cost me if I take it to the dealership. Any clue?
April 23, 2008.

Sounds like your having the same issue I am. Since I am having the same issue, I am assuming that it is safe to say that the temperature sensor is the lead cause of the problem (cheap sensor) but hard to find. I am still looking for the sensor. I found one site where it told me it was located under the ignition coil, so I need to find that now. It's just hard to move around under the hood of these cars.

Jun 30, 2008.
Ok, so I found the temperature sensor and got it replaced and now my check engine light is off. My car started with no problem, fan doesn’t kick in all the time, no jerking, no high rpms; she's purrin like a kitten. This is for everyone else if you need to know where the temperature sensor is on a Hyundai Santa Fe: When looking at the engine from the front of the car, look to the right side of the motor. You'll see the radiator hoses (top one, then bottom hose right next to each other). Put your hand on the lower radiator hose and run it underneath and toward the motor (still underneath the hose). Now between your hand will be the lower hose (above your hand) and two other lines (below your hand). As you move toward the motor you'll find a plug. That's it. You can't see it from above, but it's there. Use a 16mm deep socket to get it out (after unplugging it). Be careful, because water/antifreeze does come out and if you just were running your car it will be extremely hot. After replacing the sensor don’t forget to fill back up with water (only about 1/2 gallon or so comes out). Well that's how to replace a Temperature sensor on a 2001 Hyundai Santa Fe.

Jul 2, 2008.