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The Green Spark Plug Company£16.97Visit shop Ngk Crankshaft Engine Speed Sensor Cmc3-A504 / 81503 Inductive Type By New Ngk-Cmc3-A504
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The NGK Crankshaft Position Sensor 81503 is an essential engine management component designed for vehicle owners and mechanics seeking reliable ignition and fuel injection timing. By providing precise data to the engine control unit (ECU), this sensor ensures smooth motor operation and consistent performance. While this sensor is engineered for high durability and resistance to extreme conditions, professional installation or precise adherence to specific vehicle service manuals is required to ensure accurate synchronization.
| Model Part Number | 81503 |
|---|---|
| Brand | NGK |
Common symptoms include long cranking times, engine stalling, inconsistent idling, or a flashing check engine light.
No, but clearing existing trouble codes from the ECU using an OBD-II scanner is recommended for proper calibration.
Yes, if you have moderate mechanical experience and access to the vehicle service manual for your specific make and model.
It informs the ECU of the engine's RPM and crankshaft position, allowing for precise control of ignition and fuel injection timing.
Yes, it is designed to withstand extreme engine bay temperatures and has undergone rigorous thermal shock testing.
Verify that the electrical connector is fully seated and the wiring harness is free of damage.
Check the sensor mounting bolt for looseness; vibration can cause signal dropouts if not secured correctly.
Clear the error codes using an OBD-II scanner after installation to reset the ECU's memory.
Installation should be performed while the engine is cool to prevent burns and ensure sensor safety. Always disconnect the negative battery terminal before beginning work to prevent electrical shorts. Use your vehicle's specific service manual to locate the sensor, as placement varies by engine configuration. Ensure the mounting surface is clean of oil and grit before seating the new sensor. Tighten mounting bolts to the manufacturer's specified torque to avoid damaging the sensor housing or failing to secure it properly. For care, avoid using high-pressure water spray directly on electrical connectors during engine bay cleaning.
