Due to a problem with the automatic transmission control computer, you may experience erroneous Check Engine Light illumination; an updated control module is available.Google+
Car Problem Reports
Kia Rio Updated Control Module to Correct False Check Engine Light
Kia Rio Problem
Average Mileage: 77,750 mi (8,000 mi - 117,000 mi)
Visitor, 2001 Kia Rio, 80,000 mi
I too have a check engine light that constantly comes on, and when you take it to the shop it says that nothing is wrong.
Visitor, 2003 Kia Rio, 8,000 mi
I have changed my mass air sensor and my knock sensor and my check engine light still comes on and reads that they need to be changed . They said that my computer is not reading them .
Visitor, 2002 Kia Rio, 106,000 mi
i will drive 25 to 65 miles and check engine light comes on.When the code is checked it comes up with different transmission codes the code that came up was P1780.the car starts and drives fine,starts in neutral and park fine.I can't get it inspected until this is resolved and i am not planning on replacing modules and sensor when it could be as simple as an update.a answer from an authority on the matter would be appreciated asap.thank you