BMW Central Door Lock Actuator – System Lock 51227281939

Restore reliable central locking in your BMW with this OEM‑spec rear left (system) lock actuator – part number 51227281939. Designed to perfectly integrate with BMW’s factory central locking system, this actuator helps resolve issues like intermittent locking, inoperative rear doors, or clicky/humming lock behaviour. Built to OEM tolerances, it ensures a secure fit and long-term durability, making it an ideal replacement if your current actuator has failed or is starting to falter.

OEM Number: 7362785/7281939/7473147/7488003/51227488003, 51227281939/51227362785/51227473147/51227488003

Direct replacement – High-Quality Aftermarket

Part Condition - Brand New

Operating Mode - Electric

Number of pins - 4 -pin connector

Vehicle Equipment - For vehicles without door pull assist

Fitting Position - Rear Left - Passenger Side

Lock System - with central locking, without double sealing

Our SKU: TB51227281939_94

All our Central Door Lock Actuator Mechansim 51227281939 For Bmw X1 X2 X5 X6 are OEM quality and reliable after market car parts. This Central Door Lock Actuator Mechansim 51227281939 For Bmw X1 X2 X5 X6 is specifically compatible with BMW: 2 Series, 5 Series, 7 Series, 8 Series, i3, iX3, X1, X2, X3, X4, X5, X6, X7, Mini: Mini, Mini Clubman, Mini Countryman, .

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

FAQs

1. Which BMW models use part 51227281939?
This actuator (rear-left system lock) is genuine BMW OEM and is listed for the 2018‑2020 BMW X2 (F39).
If you’re unsure whether it fits your car, you can check your VIN or registration with us — we’re happy to confirm compatibility.

2. What are the common signs of a failing central locking actuator?

• The rear-left door does not lock or unlock when using the key fob.

• You hear humming or clicking noises when locking/unlocking.

• Central locking works sometimes but not consistently.

• The car’s door lock warning or “door open” light behaves erratically.

3. Can replacing this actuator fix my central locking problem?
Yes — if the issue is due to a faulty actuator in the rear-left door, installing this part often restores full locking function. However, if the underlying problem is electrical (e.g., wiring faults or a bad control module), additional diagnosis may be needed. Some users on forums have replaced actuators only to discover wiring issues were the real culprit. 

4. Is this part a genuine BMW OEM component?
Yes — 51227281939 is an OEM system lock actuator, originally built by BMW to their factory standards.

5. How difficult is the installation?
Replacing the actuator generally requires:

• Removing the rear door panel

• Unplugging the electrical connector from the old actuator

• Unscrewing / unclipping the old mechanism

• Fitting and securing the new actuator

If you don’t feel confident working inside a door, it’s best to let a professional do it. Incorrect installation can affect how the door latches or unlocks.

6. Is there a warranty included?
Warranty terms depend on where you buy it from. For genuine OEM parts, a 12-month (or equivalent) warranty is common — always check the seller’s listing for details.

7. Is it safe to keep driving with a broken actuator?
You can, but it’s not ideal. A faulty actuator may prevent that door from locking properly, which can be a security issue. In some cases, it may also trigger warning lights or affect how the central locking system behaves.

8. Why buy this actuator instead of a cheaper aftermarket alternative?

• High reliability — as an OEM part, it’s built to BMW’s quality standards.

• Long-term durability — fewer failures, since it’s made to original spec.

• Exact fit — engineered for a perfect fit in the rear-left door system.