Got my Icarsoft LRII today and ran a full diagnostic

P0441
P0133
P0135

4th code was right rear ABS sensor, I erased it as I plan on replacing the rear brakes in about a week so no worries there.

Now to the other three codes, I reset them and will wait for them to come back on.

P0441 - Amazon: New Purge Solenoid Valve w Harness Wire for Land Rover Discovery 2891022040 $21.40
P0133 - Amazon: Upstream O2 Oxygen Sensor for 1999-2004 Land Rover Discovery 4.0L 4.6L Part #: 234-4694, MHK100920, SU5577 $30.00
P0135 - O2 sensor heater circuit malfunction (Assuming that the NEW O2 sensor replacement for P0133 will resolve it)

 

The p0135 means the heating element in the sensor is faulty. It could also be a wiring issue, I have repaired a few harnesses on these trucks, they do break. I would just replace the sensor.

 

Thank for the feedback, I updated the codes with the parts and prices I found on Amazon.