BMW 428i Ignition Coil Guide for 2014-2016 Models
Experiencing engine misfires or a rough idle? A failing ignition coil is a likely culprit.
- A failing ignition coil will cause engine misfires, a rough idle, and turn on the check engine light.
- This is an extremely easy DIY repair that requires no special tools and can be completed in under 30 minutes.
- For best results, choose an OEM-equivalent brand like Delphi, Bosch, or NGK. Many owners prefer Delphi.
- If one coil fails on a high-mileage car, it is best practice to replace all four coils and the spark plugs at the same time.
Is a Failing Ignition Coil a Serious Problem?
Yes, a failing ignition coil should be addressed immediately. While the car may still run, it will perform poorly, with noticeable shaking, hesitation, and poor fuel economy. Continuing to drive with a misfiring cylinder can cause unburnt fuel to enter the exhaust system, potentially damaging the expensive catalytic converter. The replacement is straightforward and can prevent more costly repairs down the road.
Can I Drive with a Bad Ignition Coil?
It is not recommended. Driving with a bad coil can lead to engine damage, poor fuel economy, and unsafe driving conditions due to loss of power. It's best to get it replaced as soon as possible.
Symptoms of a Failing 2014-2016 BMW 428i Ignition Coil
Ignition coils on the N20 engine can fail from heat stress and normal wear over time. When a coil starts to go bad, the signs are usually obvious. You don't need to be a mechanic to notice something is wrong.
- Engine Misfires: The most common symptom. The engine may shake, sputter, or hesitate during acceleration. This is often most noticeable at idle.
- Check Engine Light: A failing coil will almost always trigger the check engine light. A code scanner will typically show a code from P0300 (random misfire) to P0301, P0302, P0303, or P0304, indicating a misfire in a specific cylinder.
- Rough Idle: Your car may vibrate or shake more than usual when stopped at a light or parked with the engine running.
- Reduced Power and Fuel Economy: With one cylinder not firing properly, your car will feel sluggish and you'll notice you're visiting the gas station more often.
- Difficulty Starting: In severe cases where multiple coils have failed, the car may not start at all.
Choosing the Right Aftermarket Ignition Coil
You don't need to buy a Genuine BMW part to get your 428i running smoothly again. Many aftermarket brands meet or exceed OEM quality. For this part, it's best to stick with known OEM suppliers for reliability.
Brand Quality Tiers
Premium Aftermarket (OEM-Equivalent): Brands like Bosch and Delphi are original equipment suppliers for BMW. Forum discussions often show a preference for Delphi, as BMW issued a service bulletin for other models recommending switching from Bosch to Delphi to resolve premature failures. NGK is another top-tier brand known for excellent ignition components. Choosing one of these brands is the safest bet for longevity and performance that matches the original part.
Standard Aftermarket: Brands such as Standard Ignition (SMP), Hitachi, and Walker Products offer a good balance of quality and price. They are reputable manufacturers that produce reliable parts, though they may not be the original supplier for your specific vehicle.
Economy Brands: Brands like DriveWire, Global Parts, and True Tech provide a budget-friendly option. While they can get your car back on the road, their long-term durability may not match that of the premium brands. These are a viable choice if the price is your primary concern.
Pro Tip: Replace in Sets
If your 428i has over 60,000 miles and one original coil fails, it's wise to replace all four at the same time. The other coils have been subjected to the same heat and wear and are likely to fail soon. Replacing them all at once is an easy DIY job and saves you from repeating the repair in the near future.
Cost of Replacing a BMW 428i Ignition Coil
| Part Type | Price Range (Single Coil) |
|---|---|
| New Aftermarket | $31 - $166 |
| New OEM (Genuine BMW) | $68 - $101 |
| Shop Labor | $75 - $150 |
(Pricing is an estimate and may vary based on location and supplier.)
Frequently Asked Questions (FAQ)
Is replacing an ignition coil on a 2014-2016 428i a DIY job?
Absolutely. This is one of the easiest repairs you can do on the N20 engine. The coils are located directly on top of the engine under the plastic cover. The only tools you need are your hands to remove the engine cover and unclip the electrical connector. The coil then pulls straight out. The entire job for all four coils can be done in under 30 minutes.
Should I replace my spark plugs at the same time?
It's highly recommended. Worn spark plugs put extra strain on the ignition coils, which can cause them to fail prematurely. Since you already have the coils out, you are just one step away from replacing the plugs. The recommended service interval for spark plugs on a stock N20 engine is around 60,000 miles.
Are there any recalls for the 2014-2016 BMW 428i ignition coils?
No, there are no specific recalls for ignition coils on the 2014-2016 BMW 428i. Searches on the National Highway Traffic Safety Administration (NHTSA) website show recalls for other issues like starter motors or water pumps on similar models, but not for the ignition coils themselves.
Which brand is better for my BMW, Bosch or Delphi?
Both are OEM suppliers, but many BMW enthusiasts and independent shops prefer Delphi. BMW even issued a technical service bulletin (TSB) for some engines recommending the replacement of original Bosch coils with Delphi units to fix recurring misfire issues. Given the similar price point, Delphi is often considered the superior choice for replacement.
Technical Specifications
OEM Part Numbers: 12138616153 12137594596 12138643360
Coil-on-Plug (Pencil Type), 4 required for N20/N26 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 428i:
- 🛍️ Shop This Part
- Is a Failing Ignition Coil a Serious Problem?
- Can I Drive with a Bad Ignition Coil?
- Symptoms of a Failing 2014-2016 BMW 428i Ignition Coil
- Choosing the Right Aftermarket Ignition Coil
- Brand Quality Tiers
- Pro Tip: Replace in Sets
- Cost of Replacing a BMW 428i Ignition Coil
- Frequently Asked Questions (FAQ)
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