Occasional clanking sound under car upon turning steering wheel sharply or boinging sound like a metal spring letting go.

there is a cancelation spring either metal or plastic that breaks and will cause this problem. also if the steering wheel is not centred it could be off enough that the signal will not be canceled by the spring as it won`t be pushed to the off position with the spring. it could also be a bad signal switch under the steering wheel.

remove horn cover, screws from backside of steering wheel, unplug wire to cover for the horn. loosen and remove 7/8" or 22mm nut from center. using steering wheel puller remove steering wheel. using steering wheel lock spring compressor tool compress spring and remove external snap ring. or have friend press down on cogged black plastic ring and remove snapring from shaft. dont allow spring to make things fly. now remove the three phillips headed screws and the fourth that hold turn signal lever, to the turn signal assesembly and wiggling wires from bottom end of steering column and pulling up on turn signal plastic assesembly pull until out of way. using a t20 i believe torx, six point star bit, to remove the tumbler assesembly. now reachin with a neetle nose pliers and turn. all done. and the install new tumbler. hope your not stealing it. or you can just remove plastic pannel under steering column and the two 14mm nuts holding steering column up. let it rest upon seat. remove the ingition switch with a 7 mm socket. where the rod use to connect on the bottom side of ignition switch, slide slider away to start. but this will not disengage the steering wheel lock, depending if its in the lock position or not would depend on which way i would go. if not in locked position use 2nd option just to move it. but either way to replace ignition lock cylinder, where key goes, use first method

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You've bent either the rim or the steering arms. You can't "straighten" the bent parts. Take it to a repair shop for part replacement. And soon before you have a steering failure and an accident.

If you let go of steering wheel and step on brakes does the wheel vibrate?

I'd say its either warped rotors, power steering malfunction, or possible wheel bearing, although if wheel bearing you should feel/hear a hum which would get louder depending on which way you turn the vehicle.

Cv axles normally click repetedly when moving ,doesn't sound like an axle,more like a motor mount or brake calpier .If you put your foot on the brake with the hood open ,put the truck in reverse and put a load on it and then in drive and load it you will be able to see the engine rock excessivly if a mount is bad.

sounds like one of the springs behind the horn has brokwn and is just hanging out in there and when you turn it is making contact between the horn pad and gorund. look on the side of the air bag and you should be able to pop out to little platic cover pieces and then take out both of those bolts that hold the air bag in place then you will find your problem. frist disconnect the battery

Assuming you have power steering, check fluid level in power steering system.
Check that the power steering pump belt has not fallen off.
Tires that are nearly bald can make the steering effort higher.
Do you have wheels that are not made for this car that have the wrong offset?
Check the strut bearings to see if they are frozen. Look under the front fenders while someone else turns the steering wheel. The strut and spring should turn with the wheel. If the top of the spring does not turn, then the strut bearings need to be replaced.

the powering steering hose blew the hose need to be replaced--the hose and connectors are one

sounds like the steering wheel was turned sharply one way or the other when you turned off the key...turn the wheel in the oppisite direction while turning key to take tension off the steering wheel lock

I also had this problem along with a clunk sound when I turn my steering wheel. After disconnecting the battery for 30 min I proceeded to take off the 3 small covers on my steering wheel and then take off the 2 bolts that hold my airbag on. What I found was what looks to be a piece of metal the used to be attached to 3 small rubber pillars that went to a small thin piece of metal that was screwed into the steering wheel housing that had all 3 of the rubber pillars broken and big metal piece was just flopping around inside the steering wheel causing the horn to go off when I turned. No one can tell me what this part is so I just removed it and put it back together and every thing seems to be working fine now. It did not seem to have any thing to do with the Airbag as the airbag came off in 1 piece. It has been suggested to me that it was some sort of balancing weight for the steering wheel. Even the Nissan dealer could not tell me what it was. Any ways it seems fine with out it. DW