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NGK Crankshaft Position Sensor - 81503

NGK Crankshaft Position Sensor - 81503

The NGK Crankshaft Position Sensor 81503 ensures optimal engine performance by providing critical ...

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eBayNGK CMC3-A504 81503 Crankshaft Sensor
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Product Information

Full details

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.

All features

Model Part Number81503
BrandNGK

Extended Product Information

FAQs

How do I know if my crankshaft position sensor is failing?

Common symptoms include long cranking times, engine stalling, inconsistent idling, or a flashing check engine light.

Is any special software required after installation?

No, but clearing existing trouble codes from the ECU using an OBD-II scanner is recommended for proper calibration.

Can I install this sensor myself?

Yes, if you have moderate mechanical experience and access to the vehicle service manual for your specific make and model.

What is the primary function of the 81503 sensor?

It informs the ECU of the engine's RPM and crankshaft position, allowing for precise control of ignition and fuel injection timing.

Is this sensor heat resistant?

Yes, it is designed to withstand extreme engine bay temperatures and has undergone rigorous thermal shock testing.

Troubleshooting

Vehicle fails to start after installation

Verify that the electrical connector is fully seated and the wiring harness is free of damage.

Intermittent engine stalling

Check the sensor mounting bolt for looseness; vibration can cause signal dropouts if not secured correctly.

Check engine light remains on

Clear the error codes using an OBD-II scanner after installation to reset the ECU's memory.

Pros and Cons

Pros

  • High-grade thermal shock resistance for longevity
  • Completely sealed housing prevents fluid and debris contamination
  • Ensures stable engine timing and fuel efficiency
  • Reliable signal output for consistent idling

Cons

  • Installation requires access to the transmission or engine block area
  • Incorrect positioning may lead to engine misfires
  • Compatibility is vehicle-specific and requires manual cross-referencing

Setup, Compatibility & Care

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.

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