RPM / Crankshaft Sensor - NGK NTK - 81557
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Product Information
Full details
The NGK NTK RPM / Crankshaft Sensor (81557) is designed for automotive technicians and DIY mechanics seeking a high-quality, reliable replacement component for precise engine timing. This sensor delivers consistent signal data to the engine control unit to ensure optimal fuel injection and ignition timing; however, users must verify compatibility with their specific vehicle make and model before purchase, as precise fitment is critical for functionality.
All features
| Model Part Number | 81557 |
|---|---|
| Brand | NGK NTK |
Extended Product Information
FAQs
How do I know if this sensor fits my car?
Check your vehicle owner's manual or use an online compatibility checker by comparing your vehicle's OEM part number with the NGK NTK 81557 cross-reference list.
Is any special software required for installation?
No, this is a passive sensor and does not require software programming; however, an OBD-II scanner is recommended to clear error codes.
Does this sensor come with mounting hardware?
The product includes the sensor unit; mounting bolts are generally reused from the original sensor.
What does the 3-pin oval connector indicate?
The 3-pin oval connector is a specific hardware standard ensuring this sensor mates correctly with compatible vehicle wiring looms.
Can a faulty crankshaft sensor damage my engine?
While it usually causes poor performance rather than physical damage, persistent misfires caused by incorrect timing can potentially harm catalytic converters.
Troubleshooting
Engine cranks but will not start
Ensure the 3-pin connector is fully seated and that the sensor is properly gapped or bolted to the engine block.
Check engine light remains on after install
Use an OBD-II scanner to clear existing error codes, as the computer may retain the previous 'fault' state until manually reset.
Pros and Cons
Pros
- High manufacturing standards matching OEM quality
- Reliable signal output for smooth engine performance
- Standardized 3-pin oval connector for ease of installation
- Wide range of cross-reference compatibility
Cons
- Requires specific vehicle application verification
- Installation may involve accessing tight engine bay spaces
- No included wiring cable (direct plug-in only)
Setup, Compatibility & Care
Installation should be performed while the engine is cool to prevent injury. Always disconnect the battery before beginning the replacement process to avoid electrical shorts. Locate the existing crankshaft sensor by following the wiring harness near the bottom of the engine block or transmission housing. Remove the mounting bolts, disconnect the old 3-pin oval plug, and seat the new sensor in the housing before securing it. Ensure the connector 'clicks' into place to verify a proper seal. Regular maintenance involves keeping the area around the sensor free from excessive oil buildup or debris, which can interfere with the magnetic sensor head over time.