What causes fault codes u1262 and u1027 on a 2000 jaguar s type

code p 0121 is associated with the throttle position sensor and accelerator position sensor
causes are from cable adjustment --throttle position and accelerator position sensors
code p0533 refers to ac refrigerant pressure sensor--high input== causes --ac pressure too high (cooling fault -condenser fan not running at radiator-- too much gas --pressure sensor
p 0105 refers to map sensor / barometric pressure sensor --circuit malfunction===causes wiring--- map sensor --baro sensor ECM
code p0566 refers to cruise control master switch== causes --control switch , ---ECM
code p1582 refers to electronic throttle monitor data available which will be associated with the p 0121 code and faults

the problem is in the electronics of the transmission
from your statements , it indicates that the TR sensor is not working properly and the transmission has problems selection the correct ratios
the engine light reports on both engine and transmission faults
first get the fault codes then fic/replace the items causing the codes

you have fault in the ecm network malfunction.

bottom line is the U1262 is a communication failure between your scanner and a module

assuming you actually pulled the code from the PCM then you have lost communication with a different module like the ABS, DDM, LCM, RASM, HEC, PAM and any other module I can't think of right now

You need a detailed pinpoint test from a Ford service manual or aftermarket source like Alldata, Shop key or Mitchell on Demand

You could be dealing with over a 100 different test PER module

Obviously something we can't do on-line too easily

If you could at least identify which module you have lost communications with your dealer may, for a fee, copy the correct pinpoint test

It shows that your fault management system has been recently reset. It will not bring on the engine management light. For more info on fault codes goto
http://www.bluejag.co.uk/

Both these codes relate to Catalyst efficiency below threshold on banks 1+2. This is normally caused by a combustion fault. This fault may be shown due to a faulty sensor in either air imput or exhaust systems, Get the memory read at a dealers or good garage. If you had a serious problem the car would not drive well.
Hope this helps - good luck.

Code PO430 could be = catalyst efficiency below threshold bank 2 ........ this may be caused by faults in combustion and if you have just completed repairs it may rectify itself as the car runs correctly ...... do not leave as a fault for too long as damage will occur to cat/conv.

Your codes are as follows:

U1262 communications bus fault
P0500 Vehicle Speed Sensor Malfunction
P0720 Output Speed Sensor Circuit Malfunction

What, if any, symptoms is your vehicle showing?

If your Vehicle Spped Sensor has gone bad, it can cause loss of anti-lock brakes, "anti-lock" or "brake" warning lamps on the dash, the speedometer or odometer may not work properly (or at all), your vehicle's RPM limiter may be decreased or automatic transmission shifting to be erratic.

it looks like a comminications error make sure you check all computer reated connectors before going to the dealership, i have attache a code list
hope this help