I have a 2002 Impreza and my horn now goes off when I turn the steering wheel, I cannot get to a garage for 2 weeks how can I get it to stop before my neighbours kill my car?

Horn relay

may be you should make a diagnostic and you can do it in a garage or you can do it by yourself if you want to do it by yourself you need some tools and you can find some good ones here: spobd2.com

Highly suspicious the problem is in your horn button.
And that might be on your steering wheel.
And that is where your Air Bag is. And that might mean you have air bag/horn button problems !!!!
Check with some good junk yards or body shops and see if you can find out how to change the horn button/air bag.
I just learned how 2 weeks ago, and it was really easy.
In my town, good used airbag/horn buttons go for $ 25.
Be blessed.

have to remove airbag to fix this

I don't have a diagram, but if I understand what you're saying, there is a copper ring at the top of the steering column, visible before you install the steering wheel. The copper pin is connected to the horn button. The intent being that when you press the horn button, it completes the ground from the steering wheel through the horn button, through the pin, to the copper ring.
If this is correct, there should be no contact between the steering wheel and the copper ring other than the pin. Check to see if there may have been a spacer (washer, etc) below the steering wheel on the steering shaft that holds it just far enough away from the copper ring so that only the copper pin makes contact.

sounds like the horn contact terminal inside the steering wheel got disconnected and is hitting a metal part of the steering column which triggers the horn. the terminal that got disconnected is probably has positive polarity and the metal part of the steering column has negative polarity. If they come in contact with each other... *honk* *honk*

mine did this and i noticed sometimes would work then not more i payed attention horn only worked in straight a head position (steering wheel) when i turned it quit does your do this?
If so remove the cavers that are behind the steering wheel and the trim for guages and radio (this one first steering covers next or youll break'em - i did) carefuly remove turn signal switch and very very carefully dissamble there is a littl brush that has a spring behind it (brush is round) it touches a rind on the steering column that allows the horn to sound. I streched the spring a little ot push the brush out farther ofr better contact.

You have a sliding contact behind the steering wheel (called a clock spring). It is probably bad & needs replacing. Need to remove steering wheel for access. Usually there is a code set that says whether it's the driver side air badg or passenger side air bag that's the issue.
Somtimes, you can check it yourself by reading the number of flashes once you enter self test. Read owner manual or call dealer service dept and ask for self test procedure.
For a Ford, you turn key to "on" and then press the door dome lamp switch 7 times in 10 seconds and then read the codes. Not sure about Chrysler.

it sound like the wire to your horn is loose or has come off your description ends does your horn work regularly?