My 2002 kia rio won't go in reverse. I tried to remove my speed sensor to add gear fluid and afterwards could not shift into reverse, as if it is locked out. If I remove the sensor I can shift, but when I place it back I cannot go into reverse. If I place the car in reverse while the sensor is off, then attach it then it is stuck in reverse, and cannot go back into neutral or any other gear. It is one or the other. What do I do?

SOURCE: reverse acts like neutral

whats the cars milage???trans filter service, possible bad trans??

SOURCE: transmission fluid

pull out the transmission dipstick and clean it, it should be written near the bootom of the dipstick

Harvey N Tawatao

• 3854 Answers
• Posted on May 07, 2009

SOURCE: transmission

If it is a 5 speed manual, then you add Transmission oil under the car on the upper side of the transmission. Under the hood on fire wall side there is the speedometer cable. You must remove lock down bolt with # 10 socket and lift straight up. That is where you add/check your Transmission fluid on a 5 speed. Clean the area first and it's fairly simple. 
The tube where the dipstick for the Automatic transmission is where you add the Transmission fluid. You will probably need one of those funnels with the really long neck, so that you can get the fluid into the tube without pouring it all over the place. Be careful that you don't overfill the transmission!

Good luck and hope this helps.

SOURCE: checking manual transmission fluid

Thanks for your response. We have the problem fixed, we went to our dealership.

SOURCE: transmission won`t go into reverse

Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Once you do this and let us know what, if any codes are set, then we can go from there. The problem you describe could simply be a wiring/connection problem -- no telling at this point. Now, having written that, my suspicion is the LR (Low/Reverse) clutch or the solenoid (hopfully, just the solenoid).