Your initial issue was that the key would not turn in the cylinder correct? Or is it that you can turn the key but then the steering wheel will not turn?
If it's the first one there is no option other than replacement of the entire switch assembly. The ignition switch does more than just starting the engine. It also selects the power routing for the various systems on the vehicle depending on the position of the switch. In off it shuts off power to things like the transmission controller, ABS, the engine controller and more. The remote start will let the engine start but will not power the rest of the system. If it's installed correctly it will even shut the engine off if you move the shift lever out of park without the key being turned to run.
Now if the issue is that the key itself does turn and you can start the engine with it but the steering wheel stays locked. The answer then becomes "maybe" As it will depend on which part is causing the failure. If the lock mechanism broke you might be able to remove it and get the wheel to turn, however it would really depend on what failed and where.
As for the price of the part, there are other sources than a dealer as that switch was used on a lot of Nissan and Infinity vehicles and the QX4 is basically a fully optioned Pathfinder with a nicer fit and finish. As such it shares a lot of parts with them. The part number crosses to a Airtex/Wells 1S6107 switch that runs under $200.00 or even less if you bought it online.
There was also a recall # 00V410000 on those ignition switches in 2000, you might want to see if yours was ever repaired. If you call Infinity/Nissan at 1-800-662-6200, give them your VIN and ask them if it was ever done. Not sure if they would still do anything after 18 years but it's a free call. Just don't mention the remote start as they might say you are on your own irregardless of the actual status of the recall.
Another option that could work would be to have an automotive locksmith look at it. If it's something in the cylinder at fault they might be able to repair it. But it would depend on what the issue is.
Friday, January 11th, 2019 AT 11:50 AM