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Could be a fuse. check under the hood, or around the dash for a fusebox, inside the box should be a diagram saying what each fuse is for. it should say horn, or airbags. Could also be that a wire came off of the actual horn. look around under the hood near the driver side firewall, to find the horn. there should be two wire going to it. check if there are any frays cuts, or loose connections.
Check to see if one of your brackets holding the exhaust pipe has come loose. That'll make a rattling sound - especially if it towards the end by the tailpipe. When you're accelerating - more air is forced thru your exhaust at a faster rate, so it's not moving as much as when you're sitting still and the truck is just at an idle with less air/exhaust moving thru the tailpipe. If it's only making the noise while the truck is stationary & the noise stops one the truck is moving - that pretty much rules out anything to do withe the drive-train or suspension. You are sure the noise is from the back & not coming from under the hood? If under the hood - check your oil level ASAP.
I have answered these questions before. Numerous faults will case air susp inactve warnings. dealer diagnostics will give you the answers, but you can try a few things first. Check the front susp height sensors with a voltmeter, check the compressor (under the spare tire)., Check out Rangerovers.net for other tips.
Lift the hood and have some one get under the vehicle a grab hold of any component that may be suspect for looseness, causing this noise.
Puss down on the front of the vehicle when it is not moving to re-inact the drivability problem your having. This seems like a loose bushing or possibly a loose exhaust shield. Hard to say at this point.
There are several waring lights on your dash so lets see if i can guess: does it look like this ( ! ) with some squiggly lines under it? If it is that's your tire pressure warning light tell you that one or more of your tires is low on air. after you correct you tire pressure you'll find a tire pressure reset switch just inside you glove box push it for a few seconds and your warning light should get cleared.
check owner manualis ha a swich i can remember togod but some of them work by it self when you put the gear working. star the car open the hood close to the front yopu have to hear like a little compresor that means this device is working. you remember someone jack it up the truck and forgot to shut of the swich????
The EAS can have many different faults that will give the same warning. I have had several air susp problems. First try to disconnect the battery, wait several minutes reconnect then drive car making at least on full circle. If lights remain, air pump (under spare tire ) can be checked, also valve under a cover behind right front wheel, other than these areas, the Testbook diagnostic at dealer will determine if any other parts are source of problem. Unfortunately, with the complexity of the system many other parts Height sensors, etc, etc can also cause the error message. Good Luck.