4921517 Oil Pressure Sensor Compatible with Cummins ISX ISB QSB Engine

4921517 Oil Pressure Sensor for Cummins Engine

The 4921517 oil pressure sensor is used for Cummins engine oil pressure monitoring system applications. It is also searched as an engine oil pressure sensor, pressure sensor, oil pressure switch or pressure sending unit for Cummins diesel engine service.

This page focuses on 4921517 as the main part number. Before ordering, the removed sensor should be checked by old sensor number, connector shape, pin count, thread size, sealing O-ring condition, installation position and engine serial number.

Cummins Engine Oil Pressure Monitoring Function

The oil pressure sensor monitors engine oil pressure and sends pressure information to the engine control system or dashboard signal circuit. Correct oil pressure feedback is important for engine protection, warning logic and troubleshooting.

If the sensor signal is unstable or incorrect, the engine may show an oil pressure warning, incorrect gauge reading, fault code, derate condition or intermittent electrical fault. However, low oil pressure warnings should not be diagnosed by the sensor alone; actual oil pressure, wiring and engine lubrication condition should also be checked.

Application and Engine Reference

The 4921517 pressure sensor is commonly referenced for Cummins ISX, ISB, QSB, ISM, X15 and related engine applications. Some public references also list ISX11.9, ISX15, ISB 5.9L, ISB 6.7L, ISC 8.3L, ISL/L9, QSB and QSC engine groups.

Engine names should be used as checking references only. Final fitment should be confirmed by the old sensor number, connector type, thread size, engine serial number and sensor installation position.

Connector and Thread Identification Notes

Public catalog references commonly describe the 4921517 oil pressure sensor with a 3-pin rectangular connector and M14 x 1.5 thread. Some listings also note that the sensor is supplied with an O-ring.

These details should be checked against the removed sensor before ordering. A similar-looking pressure sensor may use a different connector, thread, sealing type or pressure signal range, so engine model alone is not enough for final confirmation.

Part Number and Reference Notes

The main part number for this page is 4921517. Some public catalogs may list related checking references such as 4921744, 4087991, 4087991NX, 4358810, 050657, 904-5050 and 9045050.

These numbers should be used as catalog checking references only. They should not replace physical confirmation of the old sensor, connector, thread size and engine serial number. To keep this page focused, 4921517 should remain the primary search signal.

How to Identify the Correct 4921517 Sensor

• Check whether the old sensor number matches 4921517.

• Compare the connector shape and confirm the pin count before ordering.

• Check thread size and sealing O-ring condition.

• Confirm the engine model, engine serial number and sensor installation position.

• Inspect the wiring connector for oil contamination, looseness, corrosion or broken pins.

• Do not select the sensor only by engine family name if the old sensor number is unreadable.

Common Failure Symptoms

• Oil pressure warning light appears even when actual oil pressure is normal.

• Dashboard oil pressure reading is unstable, missing or incorrect.

• Engine fault code related to oil pressure signal or sensor circuit.

• Oil leakage around the sensor thread, sealing area or connector side.

• Intermittent warning caused by loose connector, damaged wiring or poor contact.

• Engine derate or protection response caused by incorrect oil pressure feedback.

Troubleshooting Before Replacement

Before replacing the 4921517 oil pressure sensor, inspect the engine lubrication system and electrical circuit. A warning signal may be caused by the sensor, but it may also come from actual low oil pressure, wiring failure, connector damage or oil contamination.

• Check engine oil level, oil viscosity and oil condition.

• Inspect oil filter condition and service history.

• Verify actual oil pressure with the correct service procedure when needed.

• Check the sensor connector, wiring harness and ground condition.

• Inspect for oil leakage around the sensor thread and sealing area.

• Confirm whether the fault follows the sensor or remains after electrical and lubrication checks.

Installation and Maintenance Notes

• Turn off the engine and allow hot parts to cool before sensor replacement.

• Clean the sensor area before removal to prevent dirt entering the oil passage.

• Compare the old and new sensor connector, thread and sealing area before installation.

• Replace damaged O-rings or sealing parts when needed.

• Do not force the connector if the plug shape or pin layout is different.

• After installation, check for oil leakage, warning lights and stable pressure readings.

• Maintain correct oil and filter service intervals to reduce false pressure warnings and sensor contamination.

Fitment Check Before Ordering

To reduce wrong orders, please send the old sensor number, Cummins engine model, engine serial number, connector photo, thread photo, sensor installation position photo and any visible markings before quotation.

FAQ

Q: What is 4921517?

4921517 is a Cummins pressure sensor reference commonly used as an engine oil pressure sensor in Cummins diesel engine applications.

Q: Which Cummins engines are common references?

Common references include Cummins ISX, ISB, QSB, ISM, X15 and related engine groups. Final fitment should be verified by old sensor number and engine serial number.

Q: What connector should be checked?

Public references commonly describe this sensor with a 3-pin rectangular connector. The connector shape and pin count should be compared with the removed sensor before ordering.

Q: What thread size is commonly referenced?

M14 x 1.5 is a common catalog thread reference for this sensor. Thread size and sealing type should still be checked against the old sensor.

Q: What should be checked before ordering?

Check the old sensor number, connector shape, pin count, thread size, O-ring condition, engine model, engine serial number and sensor installation position. Clear photos are recommended.