A Guide to Ignition Coils for the 2008-2016 BMW 740i (F01)
Stop engine misfires and restore your 7-Series' smooth performance by choosing the right ignition coils.
- For best results, replace all six ignition coils and spark plugs at the same time.
- Stick to OEM-equivalent brands like Bosch, Delphi, NGK, or Eldor for proven reliability on N54/N55 engines.
- Avoid the cheapest unbranded coils, as they can fail and potentially damage your engine's computer (DME).
- This is a simple DIY job that can be completed in about an hour with basic tools, saving on labor costs.
Is Your BMW 740i Stuttering? It Could Be the Ignition Coils.
A failing ignition coil is a common issue on modern BMWs, including the F01 generation 740i with its N54 and N55 turbocharged engines. The intense heat and vibration in the engine bay can cause these parts to wear out over time. When a coil starts to fail, it can't deliver the strong, consistent spark your engine needs, leading to noticeable performance problems. Ignoring the signs can lead to more than just a rough ride; it can cause damage to your catalytic converters, a much more expensive repair.
Symptoms of a Bad Ignition Coil
If your 740i is experiencing any of these issues, a bad ignition coil is a likely culprit:
- Engine Misfires: The most common symptom. You'll feel a stuttering or hesitation from the engine, especially during acceleration.
- Rough Idle: Your car may vibrate or shake more than usual when stopped.
- Check Engine Light: A failing coil will often trigger the check engine light. You may see fault codes like P0300 (random misfire) or P0301-P0306 (misfire on a specific cylinder).
- Loss of Power: Your car will feel sluggish and won't accelerate as quickly as it should.
- Worse Gas Mileage: The engine's computer tries to compensate for the weak spark by using more fuel. 🎬 Watch: How to diagnose and replace a bad ignition coil
Pro Tip: Replace Coils and Plugs Together
Experienced mechanics and BMW enthusiasts strongly recommend replacing all six ignition coils at the same time, not just the one that failed. Since they have all been exposed to the same heat and wear, the others are likely to fail soon. It's also the perfect time to replace your spark plugs. Worn spark plugs can strain the coils, causing them to fail prematurely. This ensures smooth performance and prevents you from having to do the same job again in a few months.
Choosing the Right Aftermarket Ignition Coils
You don't need to buy a genuine BMW-branded part to get top quality. Many aftermarket brands are the original equipment manufacturers (OEM) for BMW, offering the same performance without the dealership price tag. Here’s a breakdown of your options:
Tier 1: OEM-Equivalent Brands
These brands are known to be original suppliers to BMW and are trusted by enthusiasts for their quality and reliability. For the N54 and N55 engines in your 740i, these are your best bet.
- Bosch: A long-time OEM for BMW. While some older versions had issues, their current products are considered reliable.
- Delphi: Another official BMW supplier for the N55 engine. Many owners and even BMW service bulletins point to Delphi as a high-quality, durable replacement.
- NGK: Known for their high-quality spark plugs, NGK also produces reliable ignition coils that many owners use without issue.
- Eldor: Mentioned by many BMW master techs and enthusiasts as a top-tier coil, often considered an upgrade for N54/N55 engines due to its high-quality construction. 🎬 See why Eldor coils are the best upgrade for N54 engines
Tier 2: Quality Aftermarket Brands
These brands provide a good balance of quality and value. They are generally reliable and a solid choice if premium brands are out of budget.
- Standard Ignition (SMP)
- Hitachi
- Vemo
Tier 3: Economy Brands
These are your most budget-friendly options. While they can get your car back on the road, their long-term durability can be inconsistent.
- DriveWire
- Global Parts
- True Tech
A Word of Caution on Cheap Coils
Be careful with the cheapest, no-name ignition coils. Some low-quality coils can fail in a way that sends too much voltage back to the engine's main computer (the DME), potentially causing it to short out. This turns a simple, inexpensive repair into a very costly one. Sticking with a reputable brand is a smart investment.
Cost of Replacing Ignition Coils on a 2008-2016 BMW 740i
| Part Type | Estimated Cost (Set of 6) |
|---|---|
| New OEM (from dealer) | $450 - $650 |
| New Aftermarket (Tier 1) | $200 - $400 |
| New Aftermarket (Economy) | $120 - $200 |
| Shop Labor | $100 - $200 |
Frequently Asked Questions
Do I really need to replace all six ignition coils at once?
Yes, it is highly recommended. All coils have endured the same conditions, so if one has failed, the others are likely near the end of their service life. Replacing them all at once saves you from future repeat repairs.
Is it difficult to replace the ignition coils myself?
No, this is a very DIY-friendly job for most BMW owners. The coils are located directly on top of the engine and are easily accessible after removing the engine cover. Basic hand tools are all that's required.
🎬 Watch this step-by-step spark plug and coil replacement guideWhat is the difference between an OEM and an aftermarket coil?
OEM (Original Equipment Manufacturer) coils are the same parts BMW installs at the factory, often made by companies like Bosch or Delphi. High-quality aftermarket coils from these same brands offer identical performance and quality, just without the BMW logo and associated markup. Cheaper aftermarket brands may use lower-quality materials, leading to a shorter lifespan.
Can I mix different brands of ignition coils?
While it is technically possible and even allowed by some BMW service bulletins, it is not ideal. For consistent performance and to avoid any potential compatibility issues, it's best practice to use a matching set of six coils from the same brand.
Are there any recalls for 740i ignition coils?
There are no specific recalls found for ignition coils on the 2008-2016 BMW 740i. However, BMW has issued Technical Service Bulletins (TSBs) related to misfires, which recommend replacing coils in sets and sometimes point to corrosion issues on the coil's heat shield, though this corrosion doesn't always affect function. There have been recalls for other models and years related to starter motors, but not ignition coils for this specific vehicle range.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12138616153 12137594937 12138657273
Coil-on-plug design for direct ignition. Requires a set of six for the inline-6 engine. Compatible with N54 and N55 engines.
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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 740i:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your BMW 740i Stuttering? It Could Be the Ignition Coils.
- Symptoms of a Bad Ignition Coil
- Pro Tip: Replace Coils and Plugs Together
- Choosing the Right Aftermarket Ignition Coils
- Tier 1: OEM-Equivalent Brands
- Tier 2: Quality Aftermarket Brands
- Tier 3: Economy Brands
- A Word of Caution on Cheap Coils
- Cost of Replacing Ignition Coils on a 2008-2016 BMW 740i
- Frequently Asked Questions
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