Nissan X-Trail Crankshaft Position Sensor 23731-6N21A Engine Speed Signal Monitoring

Nissan X-Trail crank position sensor 23731-6N21A, direct replacement for the original part number, high compatibility across many Nissan models including X-Trail. Core function is to monitor engine speed and crank position, transmitting signals to the ECU to control ignition and injection. If the vehicle experiences starting difficulties, unstable idle, weak acceleration, or sudden stalling, sensor aging causing signal deviation is likely. Replacing with KLP brand parts restores normal engine operation, reduces fuel consumption, and clears fault warnings.