A Guide to Replacing Ignition Coils on Your 2006-2011 BMW 650i
Keep your BMW's V8 engine running smoothly by understanding when and how to replace your ignition coils.
- A rough idle and engine misfires are the most common symptoms of a failing ignition coil.
- Bosch is the original equipment brand and is the safest choice for quality and fitment; Delphi and Eldor are also excellent OEM-level alternatives.
- Always check for oil in the spark plug tubes, as a leaking valve cover gasket is a frequent cause of coil failure on the N62 engine.
- For best results and to prevent future issues, replace all eight ignition coils and all eight spark plugs at the same time.
Signs of a Failing Ignition Coil
When an ignition coil starts to fail on your 650i, the signs are usually obvious. Because the N62 V8 engine is so finely tuned, even one bad coil can disrupt its smooth operation. You will likely notice one or more of these symptoms.
Flashing Check Engine Light
If your check engine light is flashing, it signals a severe engine misfire. Unburned fuel can quickly damage your expensive catalytic converters. Avoid driving the vehicle if possible and have it inspected immediately.
Choosing the Right Aftermarket Ignition Coil
When shopping for new ignition coils, you will find several brands. They generally fall into three quality tiers. For a high-performance vehicle like the 650i, choosing a quality part is important for reliability and engine health.
Tier 1: OEM and OES Brands
These are the best choice for your BMW. They are either the original parts used by BMW or are made by the same companies to the same standards.
- Bosch: Bosch is the primary Original Equipment Manufacturer (OEM) for the 2006-2011 650i. You cannot go wrong choosing this brand for a direct, factory-quality replacement.
- Delphi: Delphi is another major OEM supplier for BMW and is considered equal in quality to Bosch. They are an excellent alternative if Bosch is not available.
- Eldor: Also a known OEM supplier to BMW, Eldor coils are favored by some enthusiasts, especially for tuned vehicles.
Tier 2: Reputable Aftermarket Brands
These brands are well-known in the industry and offer a good balance of quality and price. They are a solid choice if OEM brands are outside your budget.
- Hella
- Hitachi
- Standard Ignition (SMP)
- Walker Products
Tier 3: Economy Brands
These brands offer the lowest price but may not have the same long-term reliability or performance as higher-tier options. They can be a solution for a tight budget, but be aware that premature failure is more common.
- DriveWire
- Global Parts
- True Tech
- Vemo
Check for Oil Leaks First!
A very common reason for ignition coil failure on the N62 engine is a leaking valve cover gasket. Oil seeps into the spark plug tubes and soaks the bottom of the coil, causing it to short out and fail. Before replacing your coils, check the spark plug wells for oil. If you find oil, you must replace the valve cover gaskets, or your new coils will fail again quickly.
Ignition Coil Replacement Cost for BMW 650i
The cost to replace ignition coils can vary based on the brand you choose and whether you do the work yourself. Since your vehicle has eight coils, replacing them all at once can be a significant expense, but it is the recommended practice.
| Item | Estimated Cost (Per Coil) |
|---|---|
| New Aftermarket Ignition Coil | $31 - $85 |
| Shop Labor | $40 - $60 |
| Total Professional Replacement | $104 - $167 |
Frequently Asked Questions
Should I replace all 8 ignition coils at once?
Yes. Ignition coils are subjected to the same heat and wear. When one coil fails due to age, the others are likely near the end of their service life. Replacing all eight at the same time is highly recommended to prevent future breakdowns and save on labor costs.
Should I also replace my spark plugs?
Absolutely. The ignition coils and spark plugs work together. It is standard practice to replace the spark plugs whenever you replace the coils to ensure the entire ignition system is fresh. Worn spark plugs can also cause new coils to fail prematurely.
Is it hard to replace the ignition coils on a 650i?
No, this is a common DIY job for many BMW owners. The coils are located on top of the engine under the plastic covers. While most are easy to access, the rear two cylinders (7 and 8) can be tight. You may need to move the heater control valve or power steering fluid reservoir to get enough clearance.
Do I need to use dielectric grease?
There is conflicting advice on this. Some BMW guides specifically warn against using dielectric grease, as it can cause the coil boot to slide off the spark plug and create a misfire. Other experts recommend a very thin film on the spark plug's ceramic insulator (not inside the boot) to make future removal easier. Do not fill the coil boot with grease.
Are there any recalls for the 650i ignition coils?
No, as of early 2026, there are no active recalls from the NHTSA specifically for ignition coil failure on the 2006-2011 BMW 650i.
Technical Specifications
OEM Part Numbers: 12138616153 12137594937 12137571643 12137594938 12131712219 12137551049 12137562744 12137575010 12137594596
Coil-on-plug design, one required per cylinder. Total of 8 coils for the V8 engine.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- BMW 650i:
- 🛍️ Shop This Part
- Signs of a Failing Ignition Coil
- Flashing Check Engine Light
- Choosing the Right Aftermarket Ignition Coil
- Tier 1: OEM and OES Brands
- Tier 2: Reputable Aftermarket Brands
- Tier 3: Economy Brands
- Check for Oil Leaks First!
- Ignition Coil Replacement Cost for BMW 650i
- Frequently Asked Questions
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