2001 Hyundai Sonata problem with input and output turbine s

I also own a 2001 Hyundai Sonata, with 86,000 miles on it! I recently found out that I need a new input/output sensor on my car too. I was experiencing problems when shifting. I would be driving and my car would jerk really hard. And other times my car would not go more than 25 mph but the rpms would rev up. My car just wouldn't go anywhere. Either my car would jerk real hard and then it would take off or I would have to pull over, put it in park then wait a few minutes and then go! When searching on the internet I have seen many people complaining about the same problem! I got a quote from a mechanic and he said I only needed the input, but then he found out from his parts supplier that they are now sold as a pair. So he quoted me $150 for the both of them and around $100.00 in labor!

Yes,
I've heard from an AAMCO technician that the speed sensors are a common problem for this make/model. I've also heard that it is worth replacing them both at the same time, even if only one of them is faulty.

The problems you described are exactly what I've experienced. I think this is a problem that should be resolved before it causes any additional (and more expensive) problems. I've been quoted about $120 for both sensors (which can only be purchased through a Hyundai itself - no third-party vendors carry them) and 1.5 hours worth of labor (which is about $150). The quotes I got ranged from $350 (local mechanic) to $450 (from AAMCO and a Hyundai dealer) total. The work was performed a few weeks ago, and the shifting problems haven't appeared back, so it looks like replacing the sensors did the trick.

BTW, I didn't do the work through AAMCO because they tried to upsell the parts (by about 40%). I suggest that you get the OEM part number for the parts that you need and try to find them online, just so you know whether or not the mechanic is trying to rip you off on parts.