A Guide to Replacing Ignition Coils on the 2021-2025 BMW M3 (G80)
Keep your S58 engine running smoothly by understanding ignition coil failure and choosing the right replacement.
- A failing ignition coil on your M3 will cause engine misfires, a rough idle, and a check engine light.
- The job is DIY-friendly, requiring basic tools and about an hour of your time.
- The original Eldor coils are excellent; a quality OEM-equivalent brand like Bosch, Delphi, or NGK is a reliable replacement.
- It is highly recommended to replace your spark plugs at the same time you replace your coils.
Symptoms of a Failing Ignition Coil
The ignition coils on the S58 engine are generally reliable, but failures can still happen. When a coil starts to go bad, the symptoms are usually easy to notice. Because the coil's main job is to help create a spark, a faulty one will cause problems with how the engine runs.
The most common sign is an engine misfire. This can feel like a rough or shaky idle, engine sputtering, or hesitation when you accelerate. You may also experience a noticeable loss of power, worse gas mileage, and in serious cases, the engine could stall. A failing coil will almost always trigger the Check Engine Light. If you scan the car's computer, you'll likely see codes like P0300 (random misfire) or P0301 through P0306, which point to a misfire in a specific cylinder.
🎬 Watch this guide on diagnosing BMW engine misfire codes.Don't Ignore a Misfire
Driving with a misfiring engine is not recommended. Unburned fuel can pass into the exhaust system, potentially damaging the expensive catalytic converters. It's best to get the issue diagnosed and fixed promptly.
Choosing the Right Aftermarket Ignition Coil
When it's time to replace a coil, you have a few options. It's important to know that the original factory coils on the G80 M3, made by Eldor, are very high quality and can handle significant power, even on tuned engines. For most owners, a direct replacement is all you need.
OEM-Equivalent vs. Aftermarket Performance
OEM-Equivalent Brands: These parts are designed to meet or exceed the original factory specifications. Brands like Bosch and Delphi are major manufacturers that supply parts to many carmakers, including BMW for other components or older models. NGK and Hitachi are also well-known for producing reliable ignition and engine components. Choosing one of these brands is a safe bet for reliable, stock-level performance.
- Bosch: A massive OEM supplier. While there were reports of premature failures on older BMW engines, their modern coils are generally considered reliable.
- Delphi: Another top-tier OEM supplier that BMW has used. They are known for quality and durability.
- NGK: Famous for spark plugs, their ignition coils are also a solid choice, and many owners like to match their plugs and coils.
- Hitachi: A reputable Japanese manufacturer of automotive electronics.
Value Brands: Brands like Global Parts or Spectra typically offer a more budget-friendly option. They can be a good choice if you need to get your car back on the road without spending a lot, but they may not have the same long-term durability or performance consistency as the top-tier brands.
Pro Tip: Replace in Sets? While you only need to replace the one failed coil, it's common practice to replace them all at once, especially if your car has higher mileage. The other coils have experienced the same heat and wear, so they may fail soon after the first one. If you're doing the job yourself, replacing all six at once saves you from having to do it again in a few months.
Cost of Replacing Ignition Coils on a BMW M3
The cost can vary depending on whether you do the work yourself or go to a repair shop. The job is straightforward for a DIYer with basic tools.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Ignition Coil (Single) | $41.15 - $97.60 |
| New OEM Ignition Coil (Single) | $70 - $90 |
| Shop Labor (Diagnosis + 1 Coil Replacement) | $120 - $180 |
| Total Shop Visit (1 Coil) | $250 - $350+ |
Frequently Asked Questions
Is it hard to replace the ignition coils on a G80 M3?
No, it's a relatively easy DIY job. You need to remove the front strut brace and the engine cover to access the coils. Each coil is held in by a single 10mm bolt. You simply disconnect the wire, unbolt the coil, and pull it straight out. 🎬 See a step-by-step walkthrough of the coil replacement process. The entire job for all six coils can be done in about an hour.
Should I replace my spark plugs at the same time?
It's a great idea. You have to remove the ignition coils to get to the spark plugs anyway, so doing both at once saves a lot of time. Worn spark plugs can also put extra stress on your ignition coils, so replacing them together ensures the whole ignition system is healthy.
🎬 Watch: How to change spark plugs on the S58 engine.Are there any recalls for the 2021-2025 M3 ignition coils?
There are no widespread ignition coil recalls for the G80 M3. A service bulletin was issued in late 2020 for other BMW models due to a bad batch of coils, but it did not specifically cover the M3. Always check with the NHTSA or a BMW dealer for the most current recall information for your specific vehicle.
What's the difference between an OEM and Aftermarket coil?
OEM (Original Equipment Manufacturer) is the company that made the part for BMW initially (in this case, Eldor). Aftermarket parts are made by other companies. High-quality aftermarket brands like Bosch or Delphi often produce parts that are just as good as OEM, sometimes for less money. The stock S58 coils are excellent, so you don't need a high-performance aftermarket coil unless you are running a highly modified engine.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12138643360 12138678438 12137619385
This is a coil-on-plug, pencil-type ignition coil. The G80 M3 uses the S58 engine, which requires six individual coils, one for each cylinder.
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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.
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