I assume from your description of PCM code 43 that it is indicating an ignition coil problem. If the engine still runs well, clear the code and see if driving will cause the code to re-appear. If the code doesn't show up again, it may have been just an unexplained occurrance. If it does you may have an ignition coil going bad or some other problem in the area. If it says ignition coil it may just be something electrically connected to the ignition coil, like an intermittent short in a spark plug wire causing periodic excessive drain on the coil.
Remove the ignition, (the part that you put your key into,) and on it will be a black sticker. On this sticker will be a code. THAT code is the key code for your ignition. Go to a reputable Locksmith and take your ignition with you. Give him the code you wrote down and ask for him to make you a key for it. Have him verify that the code you read is the same one he reads off it. He'll make the key and try it in the ignition. Should it work fine, WRITE THE CODE DOWN on your quad, like under the seat or in a place you can get to and won't wear away. That way, should you be out of state riding and lose your key again, you'll have the code with you and can get another made. Should you NOT be able to read the code, take the ignition to the Locksmith and he can make a key for you anyway by picking it and taking it apart. Used to be a Locksmith, so I'm speaking from experience
Ignition switch is located above brake pedal on column. It has long flat electrical connector to it. If by ignition switch you mean the key tumbler: Remove steering wheel. Remove lock plate. Remove Turn signal switch. Remove screw retaining ignition. There should be a code stamped on the ignition. If the ignition is still good a locksmith can cut the key from the code. Might be cheaper to slap a new one if you have already got that far though.
If the radio is still in the car, Place the ignition key inside ignition and turn it to access mode. Leave it there for about an hour. After that, the anti-theft system should disable itself by flashing the word, "code" on the radio screen. Then, re-enter code. The code card should be located with the owner's manual booklets holdster inside glove box. If you can't find the code card, you might have to go to your nearest Mitsubishi Dealer to fix the problem.
The crankshaft sensor code is generic for a general ignition problem. It can be the spark plug wires, or fouled plugs. Most likely, you have one or two bad ignition coils that need to be replaced (this was the case with my 97 SL2 with that code). In my SL2, I replaced both the 1/3 & 2/4 coils (about $80 total) and the code disappeared and hasn't been back since.
The key code will be in one of two spots. The first location will be behind the ignition switch, etched into the black metal housing; think between the ignition switch and front fairing. If you do not see your code there, the lower end of your ignition switch will list this code. With a flashlight and your handlebars turned all the way to the left you can read the key code from looking at the ignition switch from the bottom right of the bike. This info was for a ninja 250/500 since you did not specify
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