A Guide to INFINITI Q50 Ignition Coils (2014-2024)
Experiencing a rough idle or poor acceleration? Your Q50's ignition coils might be the culprit.
- A rough idle, engine hesitation, and a check engine light are the primary signs of a failing ignition coil on a Q50.
- Hitachi is the original equipment manufacturer, making it a top-tier aftermarket choice for OEM quality. NGK and Delphi are also excellent options.
- While you can replace just the single failed coil, replacing all six (on V6 models) with the spark plugs is a wise preventative measure.
- The job is DIY-friendly for front coils, but rear coils on V6 engines can be challenging to access.
Is Your Q50's Ignition Coil Failing?
Ignition coils are wear-and-tear parts. Over time, engine heat and constant use can cause them to fail. For the INFINITI Q50, common symptoms of a bad ignition coil include a rough or vibrating idle, engine misfires (which can feel like a stutter or hesitation during acceleration), and a noticeable loss of power. 🎬 Watch this guide on common signs of a bad coil. You will almost certainly see the Check Engine Light illuminate, and in severe cases of misfire, it may flash. A flashing Check Engine Light is serious; it means unburned fuel might be entering your exhaust and damaging the expensive catalytic converter. It's best to avoid driving if the light is flashing.
Known Issues, Recalls, or TSBs
As of early 2026, there are no widespread recalls or Technical Service Bulletins (TSBs) specifically for ignition coil failure on the 2014-2024 INFINITI Q50. Searches of the National Highway Traffic Safety Administration (NHTSA) database did not show any recalls related to ignition coils. Any issues are typically due to normal aging and wear. However, other issues can sometimes mimic a bad coil, so proper diagnosis is key.
Choosing the Right Aftermarket Ignition Coil
When replacing ignition coils on your Q50, you have a choice between Original Equipment (OEM) and a wide range of aftermarket brands. For many Nissan and INFINITI vehicles, Hitachi is the original equipment manufacturer. This makes Hitachi aftermarket coils a top-tier choice, as they are essentially the same part without the INFINITI branding and associated dealer markup.
Aftermarket Brand Tiers for INFINITI Q50
| Tier | Brands | Quality & Performance Notes |
|---|---|---|
| Premium (OEM Quality) | Hitachi, NGK, Delphi | Hitachi is the likely OEM supplier for INFINITI, making it a direct replacement. NGK and Delphi are also highly reputable brands known for meeting or exceeding OE standards, providing excellent performance and reliability. |
| Standard (Reliable Alternatives) | Standard Ignition (SMP), Hella, Walker Products | Standard Motor Products (SMP) is a well-established brand with a generally good reputation, though quality can sometimes vary. Hella and Walker are also solid choices that offer a good balance of price and quality for daily driving. |
| Value (Budget-Friendly) | DriveWire, Skyward, True Tech, Global Parts | These brands offer a lower price point, which can be attractive for older vehicles or tight budgets. While functional, they may not offer the same longevity or precise performance as premium brands. They are often a viable option for getting a vehicle back on the road economically. |
Pro Tip: Replace in Sets?
Mechanics often debate whether to replace just the one failed coil or all of them at once. Ignition coils are not technically a maintenance item to be replaced at a set interval. However, since all the coils on your engine have the same age and have been exposed to the same conditions, if one fails, others may not be far behind. If your budget allows, especially on higher-mileage vehicles, replacing all six coils (for V6 models) at the same time as your spark plugs can save you from future repeat repairs.
Frequently Asked Questions (FAQ)
How do I know which ignition coil is bad?
The easiest way is to use an OBD2 scanner. When your check engine light is on, the scanner will read a trouble code, such as P0301 for a misfire on cylinder 1, P0302 for cylinder 2, and so on. This tells you exactly which cylinder is having the problem. You can then swap the coil from the misfiring cylinder with a coil from another cylinder. If the trouble code follows the coil to the new cylinder, you've confirmed the coil is bad.
Is it difficult to replace the ignition coils on a Q50?
The difficulty depends on your engine. On both the 3.7L V6 (VQ37VHR) and 3.0L twin-turbo V6 (VR30DDTT), the coils are located on top of the engine. Some are easy to access after removing the plastic engine cover. However, on the V6 engines, the coils at the back of the engine bay can be difficult to reach without removing other components like air intake tubes or throttle bodies. 🎬 See how to replace coils when engine components are blocking access. It's a manageable DIY job for someone with basic tools and patience, but a shop can also perform the work relatively quickly.
What is the difference between the coils for the 3.7L and 3.0t engines?
The ignition coils for the 3.7L V6 and the 3.0L twin-turbo V6 are different parts and are not interchangeable. They are designed specifically for the electrical and physical requirements of each engine. Always ensure you are buying the correct part for your specific engine and model year.
Should I replace my spark plugs at the same time?
Yes, it is highly recommended. The process to access the ignition coils is the same as accessing the spark plugs. Since you're already there, replacing the spark plugs at the same time is a smart and cost-effective move. Worn spark plugs can strain the ignition coils, leading to premature failure.
🎬 Follow this step-by-step video to install new spark plugs correctly.Helpful Videos
Technical Specifications
OEM Part Numbers: 22448-5CA0A (for 3.0t VR30DDTT) 22448-EY00A (for 3.7L VQ37VHR)
All 2014-2024 INFINITI Q50 models use a 'Coil-on-Plug' (COP) ignition system. Each engine variant (2.0t, 3.0t, 3.5L Hybrid, 3.7L) requires a specific ignition coil part number. Always verify fitment before purchasing.
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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.
- INFINITI Q50: