Honda Accord Spark Plug Replacement Guide (2019-2025)
Everything you need to know about choosing the right spark plugs for your 10th and 11th generation Honda Accord.
- Stick with NGK brand spark plugs for your 2019-2025 Accord; they are the OEM supplier and are proven to work best.
- Do not use brands other than NGK or Denso, as Honda engines are sensitive and can develop misfires with incorrect plugs.
- Your car's Maintenance Minder system will tell you when it's time for a change, typically between 60,000 and 100,000 miles.
- Symptoms like a rough idle, poor acceleration, and decreased gas mileage are strong indicators that your spark plugs may be failing.
Is it Time for New Spark Plugs?
For 2019-2025 Honda Accords, you don't need to guess when to change your spark plugs. Your car's Maintenance Minder system will display a code when the time comes. Generally, the replacement interval for the 1.5L and 2.0L turbo engines is around 60,000 to 100,000 miles, though this can vary based on your driving habits.
Common Symptoms of Failing Spark Plugs
If your spark plugs are wearing out, your Accord will likely let you know. You might notice one or more of these signs:
- Rough Idling: The engine sounds shaky or vibrates when you're stopped.
- Poor Acceleration: The car feels sluggish or hesitant when you press the gas pedal.
- Engine Misfires: You may feel a stutter or jerk from the engine, especially under load. This can also trigger a flashing Check Engine Light.
- Reduced Fuel Economy: You're filling up the gas tank more often than you used to. 🎬 Watch: A visual guide to common symptoms of bad spark plugs.
- Trouble Starting: The engine takes longer than usual to turn over.
- Check Engine Light: A steady or flashing Check Engine Light can be caused by misfires from bad spark plugs.
Known Issues: Misfires
While no specific recalls for spark plugs exist for the 2019-2025 models, older V6 Accords had a Technical Service Bulletin (TSB) for issues with spark plug fouling leading to misfire codes (P0301-P0304). Owners of newer models have also reported engine misfires that were resolved by replacing the spark plugs. Using high-quality, correct-spec plugs is critical to avoid this problem.
Choosing the Right Aftermarket Spark Plugs: OEM vs. Aftermarket
When it comes to spark plugs for a Honda, brand matters. Honda engines are known to be particular about the plugs they use.
- OEM (Original Equipment Manufacturer): The plugs you get from a Honda dealer are typically made by NGK. They are a guaranteed fit and are designed specifically for your Accord's engine.
- Aftermarket: You can get the same, or even better, quality from an aftermarket plug, as long as you choose the right brand. For a Honda Accord, the overwhelming consensus among mechanics and owners is to use NGK or Denso.
Brand Tiers for Your Accord
Tier 1: NGK
NGK is the original equipment manufacturer for many Honda vehicles, and for good reason. They are engineered for a perfect fit and optimal performance in Honda engines. Choosing NGK Iridium plugs is essentially getting an OEM-quality part, often for less money than the dealer-branded box. They are highly recommended for their durability and ability to prevent common issues like misfires.
Tier 2: Bosch
Bosch is a well-respected brand that makes high-quality iridium and platinum spark plugs. While they are a top choice for many European vehicles like BMW and Volkswagen, they are not the preferred brand for Honda engines. Some owners report issues like rough idling or misfires when using non-OEM specified brands. While a Bosch plug may work, NGK is the safer, more recommended bet for your Accord.
| Part Type | Estimated Cost (Per Plug) | Notes |
|---|---|---|
| New OEM (Dealer) | $35 - $50 | Often a re-branded NGK plug. |
| New Aftermarket (NGK Iridium) | $15 - $30 | OEM quality, considered the best choice for performance and value. |
| New Aftermarket (Bosch Iridium) | $15 - $28 | A quality plug, but not the top recommendation for Honda engines. |
Frequently Asked Questions (FAQ)
Is replacing spark plugs a DIY job?
Yes, for many owners it is. The spark plugs on the 2019-2025 Accord's 4-cylinder engines are easily accessible. The job is straightforward and typically takes less than 30 minutes with basic tools like a socket wrench, a 10mm socket, and a 14mm deep spark plug socket.
🎬 Watch this step-by-step spark plug replacement walkthrough for your Accord.Do I need to gap my new spark plugs?
Most modern iridium spark plugs from quality brands like NGK come pre-gapped from the factory for your specific vehicle. It is always a good practice to gently check the gap with a feeler gauge to ensure it matches the specification in your owner's manual, but you should not attempt to adjust the gap on a fine-wire iridium plug, as you can easily damage the delicate electrode.
What happens if I don't change my spark plugs?
Ignoring a spark plug change can lead to more serious problems. Worn plugs can cause poor fuel economy, rough running, and failed emissions tests. In worst-case scenarios, consistent engine misfires can damage your expensive catalytic converter.
Should I replace the ignition coils with the spark plugs?
It is not usually necessary to replace the ignition coils (the part that sits on top of the spark plug) at the same time as the plugs. Ignition coils are typically only replaced if they have failed and are causing a specific misfire code. 🎬 See how to diagnose failing spark plugs and ignition coils yourself. If you are not experiencing misfires, you can leave the original coils in place.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12290-6A0-A01
Socket Size: 14mm, Type: Iridium, Brand: NGK is the OEM supplier.
We Have This Part in Stock
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.
- Honda Accord: