• BMW OBD2 Scan Tool
• E8 Socket
• 8MM Socket
• 10MM Socket
• Offset O2 Sensor Wrench
• Ratchet
• Non-corrosive grease (recommended)
• BMW Scan Tool (recommended)

Ensure you conduct this DIY on a vehicle with a cold engine.

Using a BMW capable scan tool, scan for engine codes. If your bank 2 sensor 1 O2 sensors is bad, you will throw code P2629.

Disconnect the vehicle's battery to ensure safety while conducting this job.

Open your vehicle's hood by pulling the latch.

Remove the cabin air filter, HVAC cowl and all covers in the way of accessing the fuel injectors. You should only need an 8MM socket for this.

Remove the engine cover by removing the three screws that secure the it.

Unscrew the fuel rail vent cap and place it off to the side. No tools are required for this.

Before working on the fuel delivery system, the excess fuel inside of the rail will need to be vented out.

To vent, squeeze a small screwdriver against the attached nipple until all excess fuel sprays from the nipple. Placing a microfiber towel underneath is highly recommended.

Remove the fuel line by pulling it forward toward you (white arrow) while pushing down on the blue retention clip (red arrow) at the same time.

Unclip the fuel rail harness from the injectors by grabbing the front portion and carefully but firmly pulling up diagonally to the left (white arrows). Once one connector is unseated, pull up on the rest of them bit by bit until the entire harness is unclipped.

Remove the four 10MM fuel rail bolts, ensuring you're careful not to drop them. Using a ratchet with a small extension makes this step easier.

Carefully remove the fuel rail from the engine cylinder ports by grabbing and pulling up on it. Don't try removing the rail all in one go, instead release injector by injector.

It's highly recommended to replace all of the injectors at once. These injectors have 170,000 miles on them and are showing severe signs of wear and should be replaced preventatively.

Using a flathead screwdriver, remove the metal clip from the fuel injector by prying it free of the ring it holds on to.

Slide the clip back (white arrow) to remove it from the injector.

Remove the fuel injector from the rail by simply pulling it in the direction of the white arrow.

When installing new fuel injectors, it's optional to apply non-corrosive lubricating grease to the fuel injector o-rings for ease of install.

Install the new fuel injector(s) by pushing the assembly down into the fuel rail.

Align all of the injectors on the fuel rail so the connector plugs are all facing the same direction and fully aligned.

Install the fuel rail into the engine by carefully aligning the injectors and pressing it down into place.

Press the fuel rail down until the tabs on it are fully flush with the screw holes on the engine.

Re-install the four 10MM fuel rail bolts, ensuring you're careful not to drop them. Hand-torque the screws to roughly 7-10 ft-Ibs. Be careful not too over-tighten.

Install the fuel rail wiring harness by aligning the connectors and firmly pressing them down onto the injector until an audible click can be heard. Ensure each of the six connectors clicks into place on the injectors.

Install the fuel line back on to the rail by sliding it back over the retention ring. Once installed, carefully pull back and forth on the line to verify it's fully latched.

Re-install the fuel rail vent cap by screwing it back onto the rail.

Re-install all components in the vice versa of removal. i.e cabin air filter and cowl, covers, etc.

Reconnect your BMW's battery.

Using a BMW scan tool, clear all engine codes and confirm any cylinder misfire related codes are gone.

To prime the fuel pump, insert the keyfob into the ignition, press the push-start button to power on all accessories and wait 3-5 seconds. This is 1 prime cycle. Repeat 3-5 times minimum.

Test start the car to ensure the new fuel injectors work properly and there isn't a cylinder misfire. Keep an eye out for check engine lights or rough idling. If present, connect a scan tool and troubleshoot further.

Good job replacing your fuel injector(s)! Be sure to keep an eye on your dashboard for any check engine codes or rough idling.