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Genuine BMW Ignition Coil Lock Plate 12131437986 | Locking Mechanism

BMW Ignition Coil Lock Plate

If you’re facing ignition issues with your BMW, the genuine BMW 12131437986 ignition coil lock could be the source of the problem; you can order a replacement through our free shipping policy. Common symptoms such as engine misfires, poor performance, and failure to start can be directly linked to a faulty genuine BMW ignition coil lock, which may require a warranty claim. This guide will cover the primary causes of these ignition issues and provide practical, easy-to-follow troubleshooting steps for your OEM BMW ignition coil. By the end of this article, you’ll be able to take control of your car’s performance and resolve genuine BMW ignition coil problems with confidence, knowing the importance of each product and its warranty.

This article is aimed at BMW owners, DIY mechanics, and car enthusiasts who are familiar with the genuine BMW ignition system and its products. Whether you’re a professional or someone who enjoys performing your own car repairs, this guide offers valuable insights and step-by-step solutions to help you fix genuine BMW ignition coil issues with part number 12131437986 at a competitive price.

The ignition coil is essentially a transformer that steps up the low voltage from the battery to the high voltage necessary to produce a spark in the spark plugs, a crucial function of the BMW ignition coil, especially in the 328i. The spark ignites the fuel-air mixture inside the engine, which generates the power needed to move your car.

  • If the genuine BMW ignition coil lock fails, your BMW’s engine will either run inefficiently or fail to start altogether, leaving you with significant performance issues or an undrivable vehicle that may need OEM parts for repair.
Component Function Table
Component Function
Ignition Coil Lock Converts low voltage into high voltage to create the spark needed for fuel combustion.
Role in Ignition System Ensures proper spark timing and power delivery to allow the engine to start and run smoothly.

Understanding the role of the ignition coil lock helps owners recognize the importance of maintaining this part and troubleshooting it when performance issues arise.


If the ignition coil lock begins to fail, your BMW will exhibit specific symptoms that serve as early warnings. Identifying these signs early on can help you avoid more severe engine problems down the line. Here’s a detailed look at the most common symptoms:

image-8 Genuine BMW Ignition Coil Lock Plate 12131437986 | Locking Mechanism
This image credited goes to ( freepik)

A weak or faulty ignition coil can make it difficult to start your BMW’s engine, which is a common question among owners. The engine may crank longer than usual before starting, or it might not start at all. In some cases, the car may only start intermittently, indicating that the ignition coil is deteriorating.

Symptoms Table
Symptom Description
Engine Misfires Rough idling, hesitation when accelerating, poor engine performance due to improper spark timing.
Difficulty Starting Longer cranking times, intermittent engine starts, or complete failure to start.
Engine Stalling Unexpected engine shutdown while idling or driving, caused by loss of spark.
Reduced Fuel Efficiency Increased fuel consumption due to incomplete combustion.
Check Engine Light Warning indicator often triggered by ignition coil failure, typically accompanied by poor performance.

After turning off the engine, inspect the ignition coil and its electrical connections. Look for any visible damage such as cracks, corrosion, or melted parts. These can be early indicators of failure, which may require expert review to diagnose.

image-10 Genuine BMW Ignition Coil Lock Plate 12131437986 | Locking Mechanism
This image credited goes to ( freepik)

Step 4: Swap Ignition Coils

If you suspect a specific ignition coil is faulty but aren’t sure, you can swap it with a coil from a different cylinder. If the problem follows the coil to the new cylinder, it confirms that the ignition coil is defective.


Tools Needed:

  1. Disconnect the Battery: Please ensure safety before working on the ignition coil. Make sure to check the information on vehicle fitment, including the 2002-2021 BMW ignition coil lock, before proceeding. To prevent electrical shocks, always disconnect the car’s battery before starting any work on the ignition system.
  2. Remove the Engine Cover: Confirm this fits your BMW before proceeding. Use a socket wrench to remove the engine cover, providing access to the ignition coil and any related parts and accessories. Depending on your 2002-2021 BMW model, you may need to remove additional components to reach the ignition coil lock.
  3. Disconnect the Electrical Connector: Ensure you have the genuine OEM part available for a proper fit. Carefully disconnect the wiring harness attached to the faulty ignition coil. This will prevent any damage to the electrical components during the replacement process, ensuring the vehicle fitment is correct.
  4. Remove the Faulty Ignition Coil: Using an ignition coil puller, gently remove the faulty ignition coil from its position. Be careful not to damage surrounding components.
  5. Install the New Ignition Coil: Place the new ignition coil into the correct position and reconnect the wiring harness. Ensure that all electrical connections are secure and properly aligned.
  6. Reassemble the Engine Cover: Once the new coil is installed, reassemble the engine cover and reconnect the battery.
  • Always wear protective gloves and eyewear when working on electrical components.
  • Follow the manufacturer’s torque specifications when tightening bolts to avoid over-torquing.
  • Double-check all electrical connections before starting the engine.

2. Perform Regular Inspections


Taking care of your ignition system not only prevents costly repairs but also enhances your driving experience by ensuring smooth, reliable engine performance.

  • What is the purpose of the BMW Ignition Coil Lock Plate 12131437986?

    The ignition coil lock plate is designed to securely hold the ignition coil in place within the engine.

  • How do I know if my BMW ignition coil lock plate needs replacement?

    Common signs include engine misfires, a decrease in performance, the check engine light turning on, or difficulty starting the vehicle. A visual inspection may also reveal damage or wear to the lock plate.

  • s the BMW Ignition Coil Lock Plate 12131437986 compatible with all BMW models?

    No, this lock plate is specific to certain BMW models. It is important to check your vehicle’s part compatibility using the VIN or by consulting with a BMW dealer or parts specialist.

  • Can I replace the BMW Ignition Coil Lock Plate 12131437986 myself?

    Yes, with the appropriate tools and some mechanical knowledge, you can replace the ignition coil lock plate yourself. However, if you’re unsure or uncomfortable, it’s recommended to have a professional mechanic handle the replacement.

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