What You're Looking At
This is the oil pressure sender/sensor that threads into the block on Cummins ISX15 and ISX/QSX 15L engines - the ones running in most Freightliner, Kenworth, Peterbilt, and International trucks with that powerplant. It's a 3-wire sensor that feeds oil pressure data straight to the ECM, and when it goes bad you'll usually see a low oil pressure warning, a derate, or a gauge that's stuck or jumping around even though your oil's fine.
4921475 is the number Cummins stamps on the part, and it's the one you want to match up against whatever's coming out of your truck. Don't just go by engine model - go by the number on the old sensor itself.
How the Cross Numbers Line Up
This sensor cross-references to 2126981PE and 4921497, and it also lines up with Detroit Diesel's DDE-A4721530928 - which makes sense since some of these Cummins-spec sensors got used across shared platforms back in the day. Same sensing element, same thread pitch, same connector pinout on all of them.
There's not a lot of variation to worry about on this one - it's not like a wheel hub with different bolt patterns. The things to actually check are the connector style (make sure the plug matches what's on your harness) and the thread size going into the block. If your old sensor came out clean and the threads look standard, this one should thread right in.
Still - always pull the old sensor and read the number off it before you order. Cummins made small running changes over the years, and a stamped number beats a parts-book guess every time.
Ordering From PartStop
We're in Tacoma and keep this one in stock, so if you're local and need it same-day, come grab it or we'll have it ready before you finish your coffee. If you're not local, it ships nationwide and usually gets out the same day you order.
Comes with our standard 6+ month warranty. If it doesn't read right or doesn't fit what your VIN says it should, call us - we'd rather sort it over the phone than have you stuck with a sensor that doesn't work.
4921475 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 4921475. 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 |
|---|---|
| Cross-Reference | 2126981PE, 4921497 |
| Detroit Diesel (OEM) | DDE-A4721530928 |
Frequently asked questions
Does 4921475 fit my ISX15?
Most likely, but confirm it against your VIN or better yet the number stamped on the sensor you're pulling out. Cummins ran a few variations over the ISX15's production life, and matching the physical part beats guessing off the engine family name.
Is this the same as the Detroit Diesel DDE-A4721530928?
They cross-reference to each other and use the same sensing element and connector, so functionally yes. But confirm your application - if you're working on a Detroit-spec engine versus a Cummins ISX, double check with your VIN before ordering.
How do I know if the sensor's actually bad versus a wiring issue?
Check for a low oil pressure code paired with a gauge that's either pegged, dead, or jumping around while the engine sounds and runs fine. If you've got actual oil pressure confirmed with a mechanical gauge and the dash still complains, the sensor's the usual suspect.
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
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.