How do i fix an error code P0446 on my 2002 kia optima? I keep clearing it off but keeps popping up. Any Ideas?

this is the code for your speed sensor replace accordingly and then when fixed clear codes and test to see if code pops up again

Usually happens when car is low on oil, happened to me because i foolishly kept putting off oil change.

https://www.google.com/#q=2004+Kia+Optima+check+engine+light+on+codes+P0050+and+P0446.

My new Kia Optima turbo has the same problem. The dealer picked it up this monring for the second time. They tell me its a connector problem and will fixed today. Love the car and its my wifes.

I had 2006 kia optima 2.4 liter LX, I drove 150000 miles plus, it was over 100,000 miles I changed timing belt, and AC belt, alternator belt is still ok, but it was my fault, I did not change crank shaft balance belt, it next to timing belt, this very important, timing belt and crank shaft balance belt must change same time, you set all mark the same positions, you can see all clear marked
if you had OBD2 scanner is helpful to read all faulty codes if you do it your self repair
if you have any problems about KIA optima, please post on any websites, to share some ideas to other KIA optima owners, like me, I change oil every 2500 miles to make my optima runs smoother
automatic transmission fluid change every year if you put high mileage on your car, optima had hard time to find it own part some time, radiator hoses are still good condition and had hard time to find in any auto part stores in my home town, good luck and thanks for sharing.

mass air and tps would be 2 most common causes.

Check with the place that checked the codes for you. Maybe they can test the IG sensor for you. That might help. Otherwise check all the connections relating to the sensor.

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Have the altenator checked.

U need to have a auto body shop check it out. They can determine how far out of spec it is, and what is required to fix it, as they deal with car collision work every day. Good luck!!