Fuel Injector Replacement – BMW N52 6 Cylinder Engine

November 12, 2023

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Fuel Injector Replacement – BMW N52 6 Cylinder Engine

Simply put, clean fuel injectors are critical for proper engine function. Years of wear and tear can cause fuel injectors to build up deposits, creating a rough running engine and poor performance. the BMW Repair Guide strongly recommends replacing fuel injectors at 60,000 miles...no matter what your driving habits are. This article gives detailed step by step instructions on replacing the fuel injectors in the N52 inline 6-cylinder engine.

Not sure which engine you have in your BMW? Use our engine finder tool to easily identify it!

Possible Symptoms: Frequent engine stalls, rough idle, lack of performance

This repair can be used on the following BMW models:

2004

325i Sedan, 325i Touring, 325xi Sedan, 328i Touring, 330i Sedan, 330i Touring, 330xi Touring, 523i Sedan, 523i Touring, 525i Sedan, 525i Touring, 525xi Sedan, 525xi Touring, 530i Sedan, 530i Touring, 530xi Sedan, 530xi Touring, 630i Convertible, 630i Coupe, 730Li Sedan, 730i Sedan, Z4 2.5si Roadster, Z4 3.0i Roadster, Z4 3.0si Roadster,

2005

130i 5 doors, 323i Sedan, 323i Touring, 325i Coupe, 325i Sedan, 325i Touring, 325xi Coupe, 325xi Sedan, 325xi Touring, 328i Convertible, 328i Coupe, 330i Convertible, 330i Coupe, 330i Sedan, 330i Touring, 330xi Coupe, 330xi Sedan, 330xi Touring, 523i Sedan, 523i Touring, 525i Sedan, 525i Touring, 525xi Sedan, 525xi Touring, 528i Sedan, 528xi Sedan, 530i Sedan, 530i Touring, 530xi Sedan, 530xi Touring, 630i Convertible, 630i Coupe, 730Li Sedan, 730i Sedan, Z4 2.5si Roadster, Z4 3.0i Roadster, Z4 3.0si Coupe, Z4 3.0si Roadster,

2006

128i Convertible, 128i Coupe, 130i 3 doors, 130i 5 doors, 323i Coupe, 323i Sedan, 323i Touring, 325i Convertible, 325i Coupe, 325i Sedan, 325i Touring, 325xi Coupe, 325xi Sedan, 325xi Touring, 328i Convertible, 328i Coupe, 328i Sedan, 328i Touring, 328xi Coupe, 328xi Sedan, 328xi Touring, 330i Convertible, 330i Coupe, 330i Sedan, 330i Touring, 330xi Coupe, 330xi Sedan, 330xi Touring, 523Li Sedan, 523i Sedan, 523i Touring, 525Li Sedan, 525i Sedan, 525i Touring, 525xi Sedan, 525xi Touring, 528i Sedan, 528xi Sedan, 530Li Sedan, 530i Sedan, 530i Touring, 530xi Sedan, 530xi Touring, 630i Convertible, 630i Coupe, 730Li Sedan, 730i Sedan, X3 2.5si SUV, X3 3.0i SUV, X3 3.0si SUV, X5 3.0si SUV, Z4 2.5si Roadster, Z4 3.0i Roadster, Z4 3.0si Coupe, Z4 3.0si Roadster,

2007

125i Convertible, 125i Coupe, 128i Convertible, 128i Coupe, 130i 3 doors, 130i 5 doors, 323i Convertible, 323i Coupe, 323i Sedan, 323i Touring, 325i Convertible, 325i Coupe, 325i Sedan, 325i Touring, 325xi Coupe, 328i Convertible, 328i Coupe, 328i Sedan, 328i Touring, 328xi Coupe, 328xi Sedan, 328xi Touring, 330i Convertible, 330i Coupe, 330i Sedan, 330i Touring, 330xi Coupe, 330xi Touring, 523Li Sedan, 523i Sedan, 523i Touring, 525Li Sedan, 525i Sedan, 525i Touring, 525xi Sedan, 525xi Touring, 528i Sedan, 528xi Sedan, 530Li Sedan, 530i Sedan, 530i Touring, 530xi Sedan, 530xi Touring, 630i Convertible, 630i Coupe, 730Li Sedan, 730i Sedan, X3 2.5si SUV, X3 3.0i SUV, X3 3.0si SUV, X5 3.0si SUV, Z4 2.5si Roadster, Z4 3.0i Roadster, Z4 3.0si Coupe, Z4 3.0si Roadster,

2008

125i Convertible, 125i Coupe, 128i Convertible, 128i Coupe, 130i 3 doors, 130i 5 doors, 323i Convertible, 323i Coupe, 323i Sedan, 323i Touring, 325i Convertible, 325i Coupe, 325i Sedan, 325i Touring, 325xi Coupe, 325xi Sedan, 325xi Touring, 328i Convertible, 328i Coupe, 328i Sedan, 328i Touring, 328xi Coupe, 328xi Sedan, 328xi Touring, 330i Convertible, 330i Coupe, 330i Sedan, 330i Touring, 523Li Sedan, 523i Sedan, 523i Touring, 525Li Sedan, 525i Sedan, 525i Touring, 528i Sedan, 528xi Sedan, 530Li Sedan, 530i Sedan, 530i Touring, 530xi Sedan, 530xi Touring, 630i Convertible, 630i Coupe, 730Li Sedan, 730i Sedan, X1 25iX SUV, X3 2.5si SUV, X3 3.0i SUV, X3 3.0si SUV, X5 3.0si SUV, Z4 2.5si Roadster, Z4 23i Roadster, Z4 3.0i Roadster, Z4 3.0si Coupe, Z4 3.0si Roadster, Z4 30i Roadster,

2009

125i Convertible, 125i Coupe, 128i Convertible, 128i Coupe, 130i 3 doors, 130i 5 doors, 323i Convertible, 323i Coupe, 323i Sedan, 323i Touring, 325i Convertible, 325i Coupe, 325i Sedan, 325i Touring, 325xi Coupe, 325xi Sedan, 325xi Touring, 328i Convertible, 328i Coupe, 328i Sedan, 328i Touring, 328xi Coupe, 328xi Sedan, 328xi Touring, 330i Convertible, 330i Coupe, 330i Sedan, 330i Touring, 520Li Sedan, 523Li Sedan, 523i Sedan, 523i Touring, 525Li Sedan, 525i Sedan, 525i Touring, 528Li Sedan, 528i Sedan, 528xi Sedan, 530Li Sedan, 530i Sedan, 530i Touring, 530xi Sedan, 530xi Touring, 630i Convertible, 630i Coupe, 730Li Sedan, 730i Sedan, X1 25iX SUV, X3 2.5si SUV, X3 28iX SUV, X3 3.0i SUV, X3 3.0si SUV, X5 3.0si SUV, Z4 23i Roadster, Z4 30i Roadster,

2010

125i Convertible, 125i Coupe, 128i Convertible, 128i Coupe, 130i 3 doors, 130i 5 doors, 323i Convertible, 323i Coupe, 323i Sedan, 323i Touring, 325i Convertible, 325i Coupe, 325i Sedan, 325i Touring, 325xi Coupe, 325xi Sedan, 325xi Touring, 328i Convertible, 328i Coupe, 328i Sedan, 328i Touring, 328xi Coupe, 328xi Sedan, 328xi Touring, 330i Convertible, 330i Coupe, 330i Sedan, 520Li Sedan, 523Li Sedan, 523i Sedan, 523i Touring, 525Li Sedan, 525i Touring, 528Li Sedan, 528i Sedan, 530Li Sedan, 530i Sedan, 530i Touring, 530xi Touring, 630i Convertible, 630i Coupe, 730Li Sedan, 730i Sedan, X1 25iX SUV, X3 2.5si SUV, X3 28iX SUV, X3 3.0i SUV, X3 3.0si SUV, X5 3.0si SUV, Z4 23i Roadster, Z4 30i Roadster,

2011

125i Convertible, 125i Coupe, 128i Convertible, 128i Coupe, 130i 3 doors, 130i 5 doors, 323i Convertible, 323i Coupe, 323i Sedan, 323i Touring, 325i Convertible, 325i Coupe, 325i Sedan, 325xi Coupe, 325xi Sedan, 325xi Touring, 328i Convertible, 328i Coupe, 328i Sedan, 328i Touring, 328xi Coupe, 328xi Sedan, 328xi Touring, 330i Convertible, 330i Coupe, 330i Sedan, 520Li Sedan, 523Li Sedan, 523i Sedan, 523i Touring, 528Li Sedan, 528i Sedan, 530Li Sedan, 530i Sedan, 530i Touring, 730Li Sedan, 730i Sedan, X1 25iX SUV, X3 28iX SUV, Z4 23i Roadster, Z4 30i Roadster,

2012

125i Convertible, 125i Coupe, 128i Convertible, 128i Coupe, 323i Convertible, 323i Coupe, 323i Touring, 325i Convertible, 325i Coupe, 325i Sedan, 325xi Coupe, 328i Convertible, 328i Coupe, 328i Touring, 328xi Coupe, 328xi Touring, 330i Convertible, 330i Coupe, 330i Touring, 520Li Sedan, 523Li Sedan, 530Li Sedan, 530i Sedan, 530i Touring, 730Li Sedan, 730i Sedan, X3 28iX SUV,

2013

125i Convertible, 125i Coupe, 128i Convertible, 128i Coupe, 325i Convertible, 325i Coupe, 325xi Coupe, 328i Convertible, 328i Coupe, 328xi Coupe, 330i Convertible, 530Li Sedan, 530i Sedan, 530i Touring, 730Li Sedan, 730i Sedan,

2014

530Li Sedan, 730Li Sedan, 730i Sedan,

2015

730Li Sedan, 730i Sedan,

Advanced level repair.

Step 1 - Purchase Parts

You will need the following parts and supplies to perform this repair.

Fuel Injector

You can save money and buy cheaper fuel injectors, but trust us. You be will hating your decision in 10,000 miles! Only Genuine BMW fuel injectors deliver superior performance and give your vehicle that factory fresh engine responsiveness.

Step 2 - Repair Procedure

Unless otherwise noted, all vehicle repair step images in this article are copyrighted, and used courtesy of BMW of North America, Inc. .

The N52 six-cylinder engine was found in many different BMW vehicles. The following instructions may differ slightly depending on year and model.

1. Removing fuel injectors.

Click to enlarge image

- Remove the acoustical cover from the top of the engine.

For detailed instructions on removing the acoustic cover, please see our article Engine Acoustic Cover Removal – BMW N52 6 Cylinder Engine

View part diagram for this step

Fuel Injector Replacement – BMW N52 6 Cylinder Engine

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- Please note that this step is only applicable to certain years.

- Unplug electrical connections (1) on top of fuel rail and clear out of work area.

Locate and remove the Schrader valve cap from the fuel rail

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- Locate the Schrader valve cap on the side of the fuel rail and remove it.

View part diagram for this step

connect compressed air to the Schrader valve and blow fuel back into the tank (43 psi max)

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- Using compressed air, blow the fuel in the fuel rail and lines back into the tank. DO NOT exceed 43 psi!

View part diagram for this step

Click to enlarge image

- using a fuel line disconnection tool (please see our parts list to order), detach the fuel line (1).

- Using a metal pick, disconnect the metal clips securing the plastic wiring harness (2) to the top of the injectors. Pul the wiring harness free.

- Remove the four M6 hex bolts securing the fuel rail to the engine head and pull it free from the engine.

View part diagram for this step

remove metal retaining clips and pull injectors from fuel rail

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- remove the metal retaining clips (1) from each injector. Grasp the injector and pull it free from the fuel rail.

- Install new injectors into the fuel rail. make sure the metal retaing clips are secure.

- Torque the fuel rail mounting bolts to 9 Nm (6.6 ft-lb).

View part diagram for this step