i had an issue with mine some time ago, although it is a saloon not an avant so there may be differences.. but..
check if you can manually lock the boot with the key.
lock and unlock the car with the remote whilst listening to the lock area.
if you can hear the actuator moving that should...
it happens when you have the door open and turn on the ignition but dont start the engine.
the noise is the motor moving the throttle flap through its controlled range of movements.
i think it is a basic way of resetting the throttle valve position without using vag com.
no they do sound a...
do you still have the secret code?
attached to the spare keys in a long thin clear plastic thing?
if so you should be albe to code the keys to the ecu.....
if cleaning the throttle body doesn't work - ( a good starting point)
you could try the charcoal canister - i had problems with the vent to atmosphere being blocked - it comes out under the floor by the drivers door - a black pipe that goes in to the driver wheel arch.
or the evap control...
calm down dear,
yes the ross tech lead is best and will be future proof (ish) and allows you to use the latest software for you new car.
however the cheap leads work with older versions of vag com, and are supported by vagcom - they would not sell licences for older versions stating they work...
depends on the car you have, ie age
if its a c5 you can get a lead from ebay and vag com trial free, which should allow you to do basic checks.
about 50-60 quid to register it if you need to.
where are you based, there may be someone local that can assist