What You're Looking At
This is a Bosch-built common-rail piezo/solenoid injector used across the DD15 and DD16 diesel engine family, which puts it under the hood of a lot of Freightliner Cascadias and Western Star 4900/5700 trucks depending on model year and engine calibration.
0445120302 is the Bosch number stamped or labeled on the injector body itself. Detroit Diesel also runs their own part number on these through the Freightliner/DTNA parts channel, so don't be surprised if the tag on your old injector reads different than what's cast on the housing — check both before you order.
These injectors run high pressure and tight tolerances, so this isn't a 'close enough' part. It has to match your engine's fuel system calibration or you'll be back in the bay with a check engine light inside a week.
How the Cross Numbers Line Up
445120302 without the leading zero is just Bosch's number formatted differently — same part, don't let that trip you up. 0986435646 is Bosch's other internal reference for this same build, which shows up because Bosch remans and reboxes under more than one number depending on the production run.
A4720701187 and A4720701087 are Detroit Diesel / Mercedes-Benz sourcing numbers — DDC buys this exact Bosch injector and assigns it their own part number for warranty and dealer ordering purposes. That's why you'll see a Bosch number and a Detroit number both pointing at what is mechanically the same injector.
What actually matters for fit: injector length, the tip/nozzle spray pattern, the electrical connector pinout, and the calibration coding on the injector (each one is individually coded to the ECM in some applications). Two injectors can share a casting and still not be interchangeable if the internal coding doesn't match your truck's fuel system. Always pull the number off the injector you're replacing and match it before you order — don't go by engine year alone.
Ordering From PartStop
We're in Tacoma and keep injectors like this in stock for same-day pickup if you're local and need a truck back on the road. If you're not in the area, we ship nationwide and most orders go out same day if you call in before early afternoon.
This is an $899 part and it's not one where you want a guessing-game return process. Give us the number off the old injector or your VIN when you call, and we'll confirm the cross before it ships — that's on us, not on you to figure out.
Every injector we sell carries our 6+ month warranty. If it doesn't perform, we deal with it — but the front end of that deal is making sure you're ordering the right injector the first time.
0445120302 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 0445120302. 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 |
|---|---|
| OE/Cross-Ref | 445120302, 0986435646, A4720701187, A4720701087 |
Frequently asked questions
Does 0445120302 fit my Freightliner Cascadia?
Depends on which engine and calibration your Cascadia's running. This injector fits certain DD15/DD16 applications, but Freightliner used multiple injector part numbers across model years and engine builds. Give us your VIN or the number off your current injector and we'll confirm before you buy.
Is this the same as the Detroit Diesel A4720701187 injector?
Mechanically, yes — A4720701187 is Detroit's sourcing number for this same Bosch-built injector. But confirm the number on your old part matches, since injectors can carry individual calibration coding even within the same casting.
Why does this injector have four different part numbers?
Bosch builds it, Bosch sells it under two of their own numbers depending on the production batch, and Detroit Diesel buys it and reassigns their own DDC/Freightliner part number for their parts network. Same physical injector, different labels depending on who's selling it to you.
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.