What This Sensor Does
The 4921483 is a combination pressure and temperature sensor that threads into the factory port on the engine and reports oil pressure and oil temperature back to the ECM. The ECM uses those two signals for protection logic. If pressure drops or temperature climbs past threshold, the engine warns, derates, or shuts down depending on how the setup is configured.
Because the ECM acts on what this sensor tells it, a drifting sensing element causes problems that look mechanical. Techs chase oil pumps, relief valves, and bearings when the actual fault is a sensor reading low under heat. The aftermarket unit uses a calibrated pressure/temperature sensing element for stable readings across the operating range.
Failure modes are consistent. Cracked or swollen connector seals let oil and moisture into the pins. Vibration fatigues the internal element and gives you a jumpy signal. Heat soak causes the reading to wander after the engine warms. Any of those show up as intermittent low-pressure warnings that clear on restart.
Why These Numbers Cross
4921483 and 4009913 are the same sensor under two Cummins references — supersession and packaging changes generate a second number over the life of an engine family, and both show up in the field on K38 and KTA38 units. Parts books and dealer systems often list only one, which is why searches split between them.
860-T9879, T9879, and PS0485 are distributor and supplier catalog numbers from Texas Truck AC, TruckAC+, and Omega. Those companies catalog the same physical sensor under their own numbering. The thread, the port, the connector, and the electrical output are the same, so the number on the box changes but the part on the shelf does not.
These numbers are listed for identification only. PartStop is not affiliated with, endorsed by, or authorized by any OEM. Use the cross-reference as a starting point, then confirm against the number stamped on the sensor you pull or against your engine serial number.
Before You Order
Pull the old sensor and read the number on the body. That number, plus your engine serial, is what confirms fit — a cross-reference list does not. K38 and KTA38 engines show up in off-highway, marine, and power-generation service, and port configurations can vary by build.
Check the harness before you condemn the sensor. Back-probe the connector, look for green or oil-wet pins, and wiggle-test the lead while watching live data. A chafed wire against the block gives the same intermittent fault as a bad element. Replacing the sensor without fixing the harness puts you right back in the same spot.
4921483 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 4921483. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Cummins | 4009913 |
| Omega | PS0485 |
| Texas Truck AC | 860-T9879 |
| TruckAC+ | T9879 |
Frequently asked questions
Is 4009913 the same sensor as 4921483?
They cross to the same aftermarket oil pressure/temperature sensor for K38 and KTA38 applications. Cummins references show up under both numbers depending on the parts book revision. Verify against the number on your old sensor and your engine serial number before ordering.
Why does my oil pressure reading drop only when the engine is hot?
That pattern usually points at the sensor, not the oiling system. Heat soak causes a worn sensing element to drift, so the signal falls off after warm-up and reads normal again on a cold start. Confirm with a mechanical gauge on the port before replacing anything.
Will this sensor need any modification to install?
No. It is a direct replacement that threads into the factory port with the sealed connector and housing built for engine heat and vibration. Torque to your engine manual spec and check for leaks at operating temperature. Fit still needs to be confirmed by engine serial number or the number on the removed part.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
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