On my 2003 bmw code p1112 comes up how do i fix this

https://www.bimmer-service.com/bmw-error-codes/

P1112 Engine Coolant Temperature Radiator Outlet Sensor High Inpu

change the number 7 spark plug and coil.

P1112: intake plenum switchover valve control.
P1740:Torque management request circuit.
P0115:ECT sensor circuit.
P50501: NO informations, mabe

First, find the sensor. Bottom passenger side of radiator I believe. If you're lazy, just change the sensor and make sure the connector is good and tight. If not, do resistance checks on the disconnected sensor and voltage on the connected sensor, both cold and hot. The results will tell you the problem.

If the connector is loose or broken, you can get one with pigtails at your local auto parts store. Chop the old one off, splice the new one in, close up surgery, and connect.

2003 X5 bmw the trans. fail safe program comes on when driving, I was told that the trans needs to clean out and put new sensors. Is that true it gives the code 055

you will need an obd meter (ebay from $ 25) make sure it can read bmw codes, this will isolate the fault before you spend money, as there are a lot of parts that can cause this, also if you garage it they cant rip u off as you can tell them the faults, and you can come back here with the codes and some one can help again

P1112 is for a problem with the fuel-rail pressure sensor CIRCUIT.
You need a new rail-pressure sensor and modded cable.

Your torque converter is not locking up.
The solution is to have the torque converter replaced and the transmission serviced.
Hopefully, you are still under warranty and can get it repaired it for free.
If not, it can get pretty expensive.

The p0455 code means, Evaporative Emission Control System Leak Detected (no purge flow or large leak)
After you install the new gas cap, reset the code, dirve the car for a couple of days to see if the code comes back, if it comes back there might be a leak in your evap lines.