My 2004 DHS is shfting hard in first two gears only when engine has already been running for a while. it jerks and was given the p0741 code at shop. mechanic replaced separated engine mount but my service engine light is still on. do i need transmission service?or is it electrical?

https://www.700r4transmissionhq.com/p0741-kia-forte/

and with O2 sensor, it depends which one they changed.

https://www.google.com/search?q=Kia+Forte+P0171

..

toyota avanza
if the engine light is on there are fault codes to be read
these need specific diagnostic readers

when was it last serviced
going up a hill
would suspect fuel delivery issue then spark problem

I would look at the shift linkage to see if its binding or not moving properly. also the boot around the shifter can get pinched preventing the linkage from aligning properly.
there are 2 cables that run to the transaxle and they can stretch or wear out. Maybe have someone shift (engine off) and you can watch in the linkage move in the engine bay to see if anyting looks sloppy. if so you may need new cables but before that get a mechanic to verify that they are not moving right.

P0755 Shift Solenoid B Malfunction
cam not find the P1529 you can call auto zone maybe they can help

Given what you have said & the metal shavings

I would pull it & rebuild it

Not worth diagnosing the PO741 TCC issue as long as there
is metal, it is thru out the entire unit.

Nothing special about that trans because it is in a euro car

They use Gm Trans & the US Mfg uses Euro, across some vehicle lines & models

P0507 Higher idle speed than expected partially stuck open thermostat engine running colder than normal raises idle speed. Small vacuum leak raises idle speed. sticking throttle cable holding throttle plate open.
P0741 Torque Converter Clutch system stuck off : Code conditions : No engine or transaxle system codes set, engine run time over 5 seconds , Throttle Fluid pressure switch not indicating Park/Neutral,TCC commanded On @ max duty cycle, throttle angle over 8% Trans fluid Temp input 68-248f Degrees not in fuel cut off, trans gear ratio indicates 2nd, 3rd, 4th gear delivered torque 32-150 ft lbs, the PCM detected a TCC slip value that was over the torque limits . most likely cause is bad tcc solenoid or torque converter itself. Trans shop can diagnose and repair

A delay of more than a second in shifting from the neutral to drive or reverse gear, could mean that there is a problem with the transmission. If on changing from a neutral or park position to the drive or reverse gear, the car does not immediately catch the gear and move forward or backward, then it could mean a problem in the transmission. If you change gears, and you hear a sudden clunk or sudden jolt or shudder, then the shifting is not smooth and there could be a problem with the gearbox. If the engine rpm keeps increasing but there is no increase in the speed, then it could be a sign of the transmission slipping.Most automatic transmission systems, nowadays, have a check engine light or an OD light, which flashes if there is a problem with the engine.

P0741 deals with internal transmission torque converter slip. A proper scan tool that is capable of reading the sensor's data inside the transmission would show the slipping torque converter and the fluid temperature.
It is critical to know exactly what conditions are present when the code stores. If the codes were not erased, they could be old codes in it's history.
Go back to the transmission shop or where you had the work done on replacing the TCC solenoid and have them read and clear the codes history. As mentioned, they could be old codes that is being read prior to your repairs.
Thank you for using Fixya and good luck, Have a shop verify line pressure, and provided no valves in the TCC hydraulic circuit are worn, replace the torque converter. Also, Lubegard Shudder Fix will at least fix this for awhile. Or try a transmission flush by a shop that uses BG brand products.

b0429 rear seat temperature control,b1819 rear wiper motor,p0741 clutch converter

The only way to find out what caused your check engine light to come on is to get a ODB II code reader or take it to a repair shop and let them read the codes that are stored in your cars computer. The check engine light can come on for transmission problems as well as engine problems in newer cars (1996 or newer). From what I read about the three problems that are mentioned above they are not caused by the same issue. (Hate to be the bearer of bad news). For the transmission problem, I would take the car to a repair shop and get the transmission fluid and filter changed as soon as possible. The Throttle Position sensor problem will most likely be fixed by a new throttle position sensor. The battery problem sounds like it could be a short or electrical draw on the electrical system of the car. Be aware, these type of electrical problems are VERY hard to sort out because it could be almost anything. Disconnect the battery and charge it. after you know it is fully charged reconnect the battery, take each fuse out one at a time while having the bright headlights on and see if any fuses being removed cause the lights to be brighter there is a problem with the curcuit that the removed fuse protects. Don't forget, on most new cars, there are also fuses under the hood and under the dash.

I wish all 3 of you much good luck.