My key sometimes won't turn in the ignition.

replace the ignition barrel-QUICKLY.If it totally carks it, you gotta start with a chainsaw to get it out.Buy a cd-rom manual for your model. they're cheap, I bought mine off the net, even though I am licensed mechanic. If it's the same as the earlier ones,unscrew bezel surround off lock, turn they key to accessory position, i think it is, insert smallish probe or pin into hole in the thing and pull it out. Probably gotta buy one from dealer so take crutches so you can get home after he removes your left leg to pay for it. Not a big job if its the same as mine. This happens to a few of the models, so don't worry. It's an excellent system, but they do wear out.