Why would an audi a4 boot alarm keep sounding. Does it matter that the spare wheel has been taken out for repair?

what model estate or saloon. estate check the electrics at the roof point. saloon check the rubber seal also if the vents get blocked in the boot you get a build up of condensation in the boot and the boot pannels inside.

You can usually reset the system by starting the ignition with the key.

Do you mean hard to steer your steering wheel?
If you have a noise when you are turning your steering wheel, you may have low power steering fluid. Add power steering fluid into your power steering fluid reservoir to the level required (check with your manual book). Make sure you get the right power steering fluid for Audi A4. Hope it will help

Have the lock checked on the boot. It might have got out of alignment and is not making a good circuit back to the alarm. Might be a loose wire.

sounds like the air flow control sensor ,as for clunking ??this could be anything from loose wheel nuts to a shock absorber bush ?? and anything in between

transmission and engine codes normally printed on a paper label in the boot around the spare wheel well.

Try disarming the car from the trunk. Sounds like the door lock switch is not deactivating the alarm, which it should, with or without the remote.

is it a 1.8 turbo or 2.8 V6 or 2.7 biturbo V6 ? on most models what you will be looking for is a 3 letter code like ATQ or APW and is normally on a sticker on the timing belt cover, it is also stamped into the engine on a ledge up high. if no luck there check the owners manual, around the 3rd page there will be a sticker that was put in the book during predelivery inspection this sticker is about 3 inches by 3 inches and filled with id codes for almost everything. If the pdi wasn't done right another copy of the same sticker will be under or next to the spare tire in the spare tire well.

this sounds like a faulty 'boot' switch. Many of the older models had issues with picky switches

i think it would be better for you and your car to be taken to an audi service center