land rover 3, 2006 model

Question

This is for my Land Rover 3, 2006 model,
i want to fix all fault, but the 1st mechanic here made to understand that all faults are coming from one major fault which is U0402-94 ,
The problem is, the transmission gear is not "selecting" changing properly, its shows limited gear, i have changed the transmission filter and transmission oil
another problem is, the suspension is not going to a higher standard, its on a lower standard, now i scan the scan and got all this codes, what do i DO?

AFTER DIAGNOSING MY LR3 2006

U0402-94
U0416-94
U0403-94
U0421-94
U0127-87
P0170-00
P0171-00
P0174-00
P0504-64
P0504-29
B1B02-28
B1C57-14
B1C62-14

Kindly give me proper breakdown on what to do

thanks