Genuine BMW Ignition Coil Lock Plate 12131437986 | Locking Mechanism
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.
BMW 12131437986 Ignition Coil Lock with a locking mechanism for enhanced security is crucial for all U.S. BMW owners.
The genuine BMW ignition coil lock (part number 12131437986) is one of the key components in your BMW’s ignition system, ensuring the locking mechanism is functional and fits perfectly. Its main function is to convert the battery’s low voltage (typically 12 volts) into a high voltage (between 20,000 and 40,000 volts) needed to ignite the fuel-air mixture in the engine cylinders, ensuring the ignition coil operates effectively as a genuine BMW part with warranty coverage. Without a properly functioning genuine BMW ignition coil, the engine will either fail to start or perform poorly, leading to problems such as engine misfires or rough idling.
How the Genuine BMW Ignition Coil Lock Plate Works
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.
Common Signs of Ignition Coil Lock Failure
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:
Why the Ignition Coil is Critical
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.
Common Signs of Ignition Coil Lock Failure
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:

1. Engine Misfires
Engine misfires are among the first signs of ignition coil lock plate failure. Misfires occur when one or more cylinders fail to ignite properly due to insufficient voltage from the ignition coil. This results in rough idling, hesitation when accelerating, and poor overall engine performance.
2. Difficulty Starting the Engine
Make sure to return any faulty items to the shop for a replacement. Ensure you have the correct item, such as the BMW ignition coil lock plate, for your specific vehicle fitment.
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.
3. Engine Stalling
Another clear indication of ignition coil failure is sudden engine stalling. If the ignition coil lock fails while the car is idling or driving, the engine may shut off unexpectedly. This happens because the spark needed for combustion is suddenly cut off, causing the engine to stall.
4. BMW ignition coil lock plate promptly.
Reduced Fuel Efficiency can often be linked to faulty ignition coils, making it important to address any related questions about the
When the ignition coil isn’t functioning properly, the engine may struggle to ignite the fuel in the cylinders efficiently. This can lead to incomplete combustion, which not only reduces engine power but also lowers fuel efficiency, causing you to spend more on fuel.
5. Check Engine Light Illuminates
A failing ignition coil often triggers the check engine light. If your BMW’s check engine light is on and you’re experiencing any of the above symptoms, it’s highly likely that the ignition coil or ignition coil lock plate is to blame.
Troubleshooting Ignition Coil Problems
If your BMW exhibits any of the above symptoms, it’s important to take immediate steps to troubleshoot the ignition coil. A methodical approach to diagnosing the problem can save you from costly repairs and prevent further damage to your engine. Follow these steps to accurately identify the source of the issue:
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. |
Step 1: Check for Diagnostic Trouble Codes (DTCs)
Start by using an OBD2 scanner to check for diagnostic trouble codes. A code related to the ignition coil (such as P0300, P0350, or similar) will help confirm that the ignition coil is the source of the problem. The check engine light will usually be triggered when such issues arise.
Step 2: Perform a Visual Inspection
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.
Step 3: Test the Ignition Coil with a Multimeter

To verify whether the ignition coil is functioning properly, use a multimeter to measure the coil’s resistance. Compare the reading to the manufacturer’s specifications. If the resistance is too high or too low, it’s a clear sign that the ignition coil needs replacement; genuine BMW parts and accessories are recommended.
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.
Step 5: Check for Additional Symptoms
While troubleshooting, pay attention to any additional symptoms, such as reduced engine power or poor acceleration, which can further indicate ignition coil failure.
Replacing the BMW 12131437986 Ignition Coil Lock Plate is essential for maintaining engine performance.
Once you’ve diagnosed the ignition coil as the source of the problem, the next step is to replace it with an OEM BMW part. Replacing the ignition coil is a straightforward process that can be completed with basic tools.
Tools Needed:
- Socket wrench set
- Ignition coil puller
- Use a torque wrench to ensure proper installation of the ignition coil lock plate.
- Multimeter
- Protective gloves and eyewear
Step-by-Step Replacement Guide:
- 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.
- 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.
- 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.
- 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.
- 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.
- Reassemble the Engine Cover: Once the new coil is installed, reassemble the engine cover and reconnect the battery.
Safety Tips:
- 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.
Preventing Future Ignition Coil Issues Always use genuine OEM parts to ensure proper vehicle fitment.
To keep your BMW running smoothly and prevent future ignition coil problems, follow these maintenance tips, including using OEM parts.
1. Use OEM Parts
Always use genuine BMW Original Equipment Manufacturer (OEM) parts when replacing the ignition coil. OEM parts are designed specifically for your vehicle and ensure optimal performance and longevity.
2. Perform Regular Inspections
Regularly inspect the ignition coil and surrounding components for signs of wear, damage, or corrosion. Catching issues early can help prevent costly repairs down the road.
3. Maintain a Clean Engine Compartment
Dirt, debris, and moisture can affect the performance of your ignition coil and other electrical components. Keeping the engine compartment clean and dry will help extend the life of your ignition system.
If your BMW is exhibiting any of the symptoms discussed in this guide, don’t wait! Take the time to troubleshoot the ignition coil lock today. Whether you replace the ignition coil yourself or consult a professional mechanic, addressing the issue early will help keep your BMW running at peak performance.
Conclusion: Ignition Coil Care for Long-Term Performance
By following the steps outlined in this guide, you can diagnose and repair ignition coil problems with confidence. Regular maintenance and proactive troubleshooting will help prevent future failures and keep your BMW’s ignition system in optimal condition. Prioritize using OEM parts, and remember to perform routine inspections to ensure your vehicle continues to deliver the high performance BMWs are known for.
Taking care of your ignition system not only prevents costly repairs but also enhances your driving experience by ensuring smooth, reliable engine performance.
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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.
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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.
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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.
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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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