2001 land rover code po733 po734 incorrect ratio

SOURCE: sunroof leaks on 2001 land rover discovery

should be a seal issue, not mechanical. Is the roof opening/closing properly? If so, while open examine the weatherstripping and look for damage or abnormal wear. with power roofs, sometimes the movement wears down the sealing abilty pending on its usage or debris hiding inside.

SOURCE: land rover sputtering

yes you should chek your sparking plugs, and the air filter too

SOURCE: 2001 land rover discovery change air conditioner

To change the temperature reading from C to F (or vice versa), press and hold the recirculation button, then press the off button holding the switch down for 3 seconds or more until an audible beep is emitted. If the battery is disconnected and then reconnected, the temperature reading will revert to C. Turning the ignition on/off will not change the customer's set preference.
(See http://www.discotech.info/index.php?title=Climate_Control for more customer configuration options for the climate control)

SOURCE: 2001 land rover discovery II locate fuel filter and fuel pump

If you're standing looking at the rear of the vehicle, it's on the chassis rail on the right hand side rear wheel arch.

SOURCE: 2001 land rover discovery II locate fuel filter and fuel pump

for Land Rover Discovery 1999-2004 no more external Fuel Filter serviceable anymore...it's a built-in part with the fuel pump. so if you want to change the filter then change the whole fuel PUMP.