Do I need to remove my transmission to change the freeze plug in a 2001 Kia Rio?

SOURCE: Check engine lite says the Throttle Postion Sensor is Bad

The TPS is usually located on the inlet manifold at the rear of the engine.If you look at where the accelerator cable connects to the throttle housing it should be there. It's held on by 2 torx or hex head screws & has a wiring block connector with 3 wires going in to it. This connector should simply pull off when you squeeze the clasp. You didnt say which engine you have but the TPS is similar across the range. You must make sure the ignition is off when unplugging it otherwise you will generate a fault code in the Engine Managment System. Once replaced switch the ignition on for 5 seconds & then switch off. This should position the sensor ready to start the engine.

SOURCE: 2001 kia rio fuel pump does not work

Are you positive its the fuel pump? Have you tried running the pump with the return line off to see if it pumps fuel? They don't always have to make a noise.

Also refer to www.kiatech.info

SOURCE: 2003 kia rio I changed the fuel filter the car

had similar problem, 2003 rio 1.6l idle fine and die when trying to accelerate or lurch and die ran fine in reverse change timing belt,wires plugs, had codes for multi cyl misfire and low injector voltage, still same lurch and die. try wiggle test on sensor plugs and main engine harness between battery and engine . i did this and found car smoothed out,tried wiggle again and car died,took harness apart where i wiggled it and found broken wire to crank sensor.good now

SOURCE: gear box oil filler plug - kia rio 2004

you have to take off the speedometer cable/wiring harness from the top of the trans and fill it from there....one 10mm bolt...very awkward spot...it might be snug, so just take a flat head screwdriver from underneath to tap it loose...

SOURCE: 2003 Kia Rio manual transmission, stick is stiff g...

I would check the operation of the shifter cable. It may need lubricated.