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If the 2002 Nissan Pathfinder's immobilizer malfunctions, you'll encounter several issues. The initial problem you'll notice is erratic lock behavior, with them locking and unlocking unexpectedly and in quick succession. Furthermore, the key may struggle to turn in the ignition, or even if it does, the engine may not start. If the engine does start, you might experience reduced power and acceleration. Replacing the system typically costs around $200 for parts and an additional $100 for labor. However, it's not overly difficult to replace the system yourself, allowing you to potentially save some money.
To disable the immobilizer on a 2002 Nissan Pathfinder, insert the key and keep it in the on position for 10 minutes. After that, turn the key off, wait for five seconds, and then start the vehicle.