Check Engine Light illumination—combined with a lack of power or a stumble on acceleration—may be caused by the throttle position switch (TPS). Kia released an improved part which should correct this concern.
Car Problem Reports
Kia Optima Faulty Throttle Position Switch
Kia Optima Problem
Exhaust & Emissions Affected: 2.7L V6
Average Mileage: 85,544 mi (30,000 mi - 183,000 mi)
Visitor, 2007 Kia Optima, 79,000 mi
Check engine light came on & car would not go over 15 mph. Shut off & restarted & it was ok. Light came on again. Took to dealership & they replaced the TPS sensor for around $400. 11 months later the same thing happens. Take back to dealership & only under warranty for 12 months or 12,000 miles so i was s.o.l. In the process of getting the sensor to replace then this car is going up for sale....has had several recalls & lots of little but expensive things break or go wrong with it since we purchased it. First & last Kia I will ever own!
Car will not accelerate past 1900rpm. Goes about 20mph and 5 mph uphill. it does this intermittently. Not fixed yet
Visitor, 2006 Kia Optima, 94,000 mi
Faulty Throttle Position Switch Cost $750.00 to fix at KIA.
Visitor, 2004 Kia Optima
engine had a hesitation when gas peddle was pushed acted like i had water in the gas, check enging lite came on had it checked /was throttle position switch put on new one now after about 20,000miles it is doing same thing ,had it checked and once again it is the throttle position switch.
Visitor, 2005 Kia Optima, 70,849 mi
car does not down shift to second gear, i was told it was the output sensor. the price for this part is $110.00 can not afford it at this time.
Visitor, 2010 Kia Optima, 59,860 mi
It's not happening every time, but when it does the Kia is accelerating with a delay or it seems like it stutters before accelerating.
Today for the first time we had the Check Engine Light show up for more than just a few seconds. It was on the whole time we drove it this morning and we scheduled an appointment with the dealership, of course by the time we were going to drive there the light didn't come back on!!!
This is the 4th issue with our Kia in less than 14 monthes!!!
This will also be our last KIA ever!
Visitor, 2008 Kia Optima, 40,000 mi
I have the same problem also, there is a light on the dashboard and when I press the fuel pedal I don't get the thrust I need, the rpm wont rise as needed and it will take time before I reach the desired acceleration.
Visitor, 2007 Kia Optima, 99,000 mi
2007 optima will not accelerate when engine light goes on, been in some scary situations because of this.
Visitor, 2008 Kia Optima, 74,597 mi
My 08 kia optima would not start correctly, so I thought it was a battery/starter/alternator issue. I took it in to my local KIA dealer who said it was my battery and throttle sensor the only way to get a new sensor is to get a new throttle body. Cost a bit over 400 and their labor bring it to over 500.00 to repair. Plus battery/starter/alternator test 29.95 and new battery 99.00...total around 700. sept 5 2013
Visitor, 2006 Kia Optima, 66,700 mi
engine light comes on intermittently, causing the car to drive in safe mode 25mph. Diagnosed at parts store. Codes read probable problem with throttle position sensor. Garage diagnosed the same. Garage manager states the whole throttle body has to be removed and taken apart to get to TPS. They erased the codes. Car engine light went off again and runs normal. Having 2nd garage look at car and hope they can still read the codes because the car will do the same thing again unexpectedly. What was going to be a simple fix is supposedly now a whole throttle body according to the 1st garage. Dealership says it is not covered by my warranty. This is a faulty part. My car is an '06 with less than 70,000m. Why isn't there a recall?