Your BMW 3.0L engine can have either the N51 SULEV engine or the N52 non-SULEV engine. The injectors are not something to order by model name alone. This guide shows you how to tell them apart and directs confirmed N52 owners to the correct rebuilt OEM set.
The replacement set sold on this page is for confirmed N52 applications only. It is not sold as an N51 SULEV replacement.
The 13537531634 / 7531634 set linked on this page is for N52 applications only. N51 SULEV owners we can service your set . Confirm the engine as N52 and emissions as non-SULEV before ordering our injectors.
No. BMW N51 SULEV and N52 engines use different injectors and not interchangeable. The set sold us is the N52 injector marked 13-53-7-531-634 or 7531634. Do not buy it for an N51 simply because both engines appear in a 128i or 328i.
The engines are closely related, but the emissions package and fuel-system application matter. Use the information below as a screening guide, then verify the OE number on your vehicle before ordering.
Standard non-SULEV application used in many naturally aspirated BMW inline-six models.
SULEV II variant developed around a different emissions and fuel-system package.
“2009 BMW 328i fuel injectors” is not a complete fitment description. Depending on the vehicle's emissions certification, a 328i or 128i may have an N51 or N52. Both can be 3.0L naturally aspirated cars, so displacement and model badge alone do not settle the question.
Use more than one check whenever possible. The original injector number is the strongest purchasing reference.
Check the vehicle emissions label under the hood. SULEV generally identifies the N51 application. ULEV or LEV generally points to the N52 application.
Look for 13537531634, 13-53-7-531-634, or 7531634 on the original injector. Those numbers match the N52 set sold here.
Confirm the engine designation through a BMW parts catalog or contact us with the VIN, emissions-label photo, and original injector number before buying.
Your original injector reads 13537531634 or 7531634 and the vehicle is confirmed as an N52 application.
The label says SULEV, the engine is identified as N51, or the original injector carries a different OE number.
“128i,” “328i,” and “3.0L” are not enough by themselves. Check the label, VIN, and injector number before purchasing.
Restore the original N52 fuel-system fitment without gambling on inexpensive unbranded replicas. These are genuine BMW/Siemens injector cores professionally serviced and sold as a complete six-injector set.
Fitment is determined by engine and OE part number—not by year, model, or displacement alone.
These are common North American N52 examples, not a substitute for OE-number verification. Some 128i and 328i vehicles use the N51 SULEV engine instead.
Fuel injector problems can affect drivability, but these symptoms are not injector-specific on their own.
Your original N51 port injectors may still be candidates for professional ASNU cleaning, leak testing, spray-pattern evaluation, and flow testing. Contact us before sending them because not every injector type is accepted for service.
No. They are separate engine and fuel-system applications with different BMW injector part numbers. Match the injector to the engine designation and the OE number removed from the vehicle.
The set sold by Precision Auto Injectors is supported as an N52 replacement and is not sold for N51 SULEV applications. Confirm the original injector number before ordering.
Check the emissions label under the hood, verify the engine by VIN, and read the original injector number. SULEV generally indicates N51, while ULEV or LEV generally indicates N52. The injector number is the strongest purchasing reference.
We sell a rebuilt genuine set of six BMW/Siemens injectors with BMW part number 13-53-7-531-634, continuous number 13537531634, and Siemens marking 7531634.
A common N51 SULEV injector number is 13-53-7-574-376 or 13537574376. BMW applications can vary, so verify the VIN and the number on the original injector.
No. The 328i was available with both N51 SULEV and N52 non-SULEV applications. Year, model, and 3.0L displacement alone do not confirm injector fitment.
No. The N52 set on this page is not for 335i/335is turbo direct-injection engines and is not an M3 injector set.
They are professionally rebuilt genuine BMW/Siemens OEM injectors—not inexpensive new aftermarket replicas. The set is cleaned, tested, serviced with new replacement components as applicable, and covered by our lifetime replacement warranty.
View the rebuilt genuine BMW/Siemens set of six, current inventory, shipping options, and warranty details.
