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There is a buzzing noise from the engine compartment even with the engine OFF. The noise increases and decreases in intensity. Whatever it was, caused the battery to die. May have started after singoe occurrance of heavy breaking.
I finally got the chance to change out the battery and that seems to fix the problem. The auto parts place checked the battery and it had a dead short. When the battery died, the noise stopped. With the new battery, everything (knock on wood) is back to running ok. All anyone I talk to can say it that with the shorted battery, it was causing the computer to act up. As far as I know, the computer is in the area of the instrument panel and is always alive even with the car off just to keep track of stuff. I would have your battery checked. Hope I have been of some assistance. Please let me know what happened.
Did the Buzz ever stop and start on its own, or was that the only time, when it drained your battery?
I think I had the same buzzing noise last saturday. I noticed it when I got out of the car with the keys in my hand and the ignition off. I waited for it to go away but it didn't. I started the car and turned it off again, but it kept buzzing. An hour later, after reading your post, I unhooked the Negative battery cable and it stopped. Monday morning I made an appointment at The M Shop in Eagle Rock CA. I hooked up the negative cable. The buzzing was there for a few seconds then went away. I fired up the engine and drove about 8 miles to the shop and it still wasn't buzzing. I've driven it another 10 - 15 miles today and still no buzz. Now I'm listening every time I get out of the car.
I'd like to know if it happened more then once?
The buzzing was there when the key was turned off. After a 3-hour meeting the buzzing was still there. The car was started and driven home. The buzzing was still there when the key was turned off. The next morning, the MINI would not start. The battery was completely dead, no light, no attempt to start, nothing. We had the battery checked and it was completely shot. Replacing the battery, so far, fixed the problem. As an add-on, the day the buzzing started, the driver had to make a panic stop. A person familiar with batteries said that sometimes after a panic stop or any other sudden shaking of the battery, all the build up on the individual plates comes loose and shorts out the battery. When you disconnected the negative (ground) lead, you may have reset everything. You can ask a battery expert about that.
I've driven about 65 miles since yesterday with no buzzing noise or battery drain. The car started fine this morning. I had emailed the shop before I took it in and they wrote back that it might be coming from the power steering pump fan. I wrote them back asking if there would be any other symptoms for that.
Since the buzzing stopped I keep wondering if it is working correctly or is it dead? I dont know how to tell. I do know if the power steering pump goes bad its big buck to fix.