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Replacing spark plugs on a 2018-2022 Honda Accord can restore crisp throttle response, steadier idle, and more reliable cold starts. The right spark plugs matter because they directly affect combustion quality, fuel economy, and the risk of misfires that trigger engine diagnostics. Whether you have the base engine or a turbo option in that year range, selecting plugs that match the Accord's required heat range and electrode style reduces maintenance headaches.This guide shortlists the top spark plugs chosen for compatibility, durability, and ease of installation for 2018-2022 Honda Accord owners. We evaluate longevity, correct heat range and gap specifications, and how plugs influence drivability, so you can pick the option that fits your driving habits and maintenance plan.
Looking for other parts? See all Honda Accord parts & accessories.
Top Picks at a Glance
| Best Quality Built to a higher standard if you want something more solid | OVERSTOCKDIRECT NGK DILZKAR7D11S Iridium Spark Plugs (4-Pack) |  |
| Best Value The sweet spot between price and what you get | XYWZV Iridium Spark Plugs 12290-6A0-A01 — 4-Pack |  |
| Best Budget The cheapest option that still gets the job done reliably | yeeluzan Double Iridium Spark Plugs, 4-Pack |  |
| Highest Rated A top-rated pick with lots of positive feedback | OVERSTOCKDIRECT NGK Laser Iridium Spark Plugs DILKAR8P8SY (4-Pack) |  |
| Most Popular A crowd favorite that many people choose with confidence | NGK Iridium IX Spark Plug LKAR7BIX-11S, 4 Pack |  |
| Best Seller A high-volume bestseller chosen again and again | autoexact Ignition Coil Packs and Iridium Spark Plugs Kit (Set of 4) |  |
1. OVERSTOCKDIRECT NGK DILZKAR7D11S Iridium Spark Plugs (4-Pack)
| Thread Size | M12 – 1.25 |
|---|---|
| Reach | 26.5mm |
| Gap | 0.044" (1.1mm) |
| Material | Iridium |
| Resistor | 5k Ohm |
These iridium fine-wire spark plugs replace factory units and are aimed at restoring or maintaining efficient ignition in 2.0L Honda four-cylinder engines from recent model years. They are made with a projected tip, taper-cut 0.6mm center electrode and a 5k ohm resistor to reduce radio interference while delivering a stable spark across conditions. Installation is typical for spark plugs and may require a 14mm thin-wall socket because of limited space around the plug wells. The plugs come pre-gapped to about 0.044" but can be adjusted carefully using a round-wire gap tool if needed. Practical benefits include longer life and steadier combustion compared with standard copper plugs, plus compatibility with factory ignition systems. Limitations are that thin fine-wire electrodes are fragile during manual gap changes and tight engine bays may make installation awkward for hobbyists without the right socket or extension. These are a direct replacement option for owners wanting a durable ignition upgrade without changing ignition hardware.
Best for: Buyers focused on extracting reliable, consistent performance from a 2018–2022 Honda Accord 2.0L engine who want a long‑life replacement that matches factory ignition behavior.
Less Ideal for: If you prefer heavy-duty racing plugs or dramatically different heat ranges for extreme tuning, choose purpose-built performance plugs instead.
- Iridium fine-wire center electrode for longer service life and consistent spark
- Projected taper-cut tip improves ignition stability and combustion
- Factory-style resistor (5k Ohm) minimizes radio interference
- Pre-set gap close to factory specs reduces initial setup work
- Fine-wire electrode is delicate and can be damaged if gap adjusted improperly
- Tight plug well access may require a thin-wall 14mm socket and care during installation
Verdict: A direct-fit iridium replacement that delivers longer life and steadier combustion for performance-minded Accord owners seeking a factory-compatible ignition upgrade.
2. XYWZV Iridium Spark Plugs 12290-6A0-A01 — 4-Pack
| Thread Size | M14x1.5 |
|---|---|
| Core Material | Iridium |
| Top Material Type | Iridium |
| Automotive Fit Type | Vehicle Specific Fit |
These XYWZV iridium spark plugs are a direct-fit replacement set sold as four units for complete service on applicable Honda and Acura engines. Made with an iridium core and tip, they are designed to resist wear and high temperatures longer than conventional plugs, which the listing says supports service life in the 60,000 to 80,000 kilometer range. In practice you would install them when doing routine tune-ups or to address misfires, rough idle, hard starting, or decreased fuel economy. The vehicle-specific fit and listed OEM-equivalent numbers simplify selection for compatible Accords and related models. Expect improved combustion stability and smoother throttle response compared with worn plugs, and the precision manufacturing should make installation straightforward. Limits to note are that longevity claims depend on driving conditions and proper gap/torque during install, and the product listing does not include detailed warranty information or OE-brand packaging. For buyers who keep up with regular maintenance these plugs offer a cost-effective way to refresh ignition performance on supported Honda vehicles.
Best for: Drivers who want a durable, vehicle-matched spark plug set to restore engine smoothness and fuel efficiency as part of routine maintenance and who prioritize practical, long-lasting replacements.
Less Ideal for: Buyers seeking branded factory replacement parts with explicit manufacturer warranty coverage or those needing a plug for a vehicle not listed in the compatibility details should look elsewhere.
- Iridium core and tip for improved wear resistance and high-temperature durability
- Sold as a 4-pack providing a full set for one engine service
- Vehicle-specific fit with OEM-equivalent part numbers to simplify selection and fitment
- No clear manufacturer warranty or support information provided
- Longevity estimates are stated by the seller and will vary with driving conditions and installation quality
Verdict: A practical, vehicle-matched iridium 4-pack that refreshes ignition performance for supported Honda Accord engines and other listed Honda/Acura models.
3. yeeluzan Double Iridium Spark Plugs, 4-Pack
| Included Components | 4 x Iridium Spark Plugs |
|---|---|
| Core Material | Iridium |
| Top Material Type | Iridium |
| Compatible with Vehicle Type | Accord 2018-2024, CR-V 2023-2024, Civic 2022-2023, Integra 2023-2024, MDX 2023-2024, RDX 2019-2024, TLX 2021-2023 |
These double iridium spark plugs are a budget-friendly replacement option for late-model Honda and Acura engines listed on the product page. They install like standard plug replacements and are sold as a set of four, so they are convenient for a full-bank swap on four-cylinder engines or partial replacement on V6s. The iridium core and tip are intended to improve durability and maintain a strong spark compared with basic copper plugs, which can help with starting, throttle response, and steady idle. Practical benefits include longer service life than conventional plugs and compatibility with the listed Accord model years, so you can replace worn plugs without changing ignition strategy or gaps. The main limitations are that this is an aftermarket part from a lesser-known brand and warranty/support is limited to one year, so buyers who prioritize brand-name assurance or extended coverage may prefer factory-quality replacements or OEM branded alternatives.
Best for: Buyers looking to replace worn spark plugs on a budget who want better longevity than basic plugs without paying for OEM branded parts.
Less Ideal for: Drivers seeking manufacturer-branded replacements or extended warranty coverage should consider factory-quality plugs instead.
- Iridium core and tip for improved durability and spark consistency over basic plugs
- Sold in a 4-pack for convenient full-bank replacement
- Listed compatibility with 2018–2024 Accord models and other specific Honda and Acura vehicles
- Universal fit design simplifies selection for the listed part numbers
- Aftermarket brand with limited one-year warranty and less-established support
Verdict: A cost-conscious iridium replacement set that gives better durability than basic plugs while matching the spark plug fitment for late-model Accords.
4. OVERSTOCKDIRECT NGK Laser Iridium Spark Plugs DILKAR8P8SY (4-Pack)
| Model Number | DILKAR8P8SY |
|---|---|
| Thread Size | M12 – 1.25 |
| Center Electrode Tip Material | Iridium |
| Ground Electrode Tip Material | Platinum |
| Pre-Gap Size | 0.030 in (0.75 mm) |
These NGK Laser Iridium spark plugs (DILKAR8P8SY) are a factory-quality replacement intended to restore or maintain reliable ignition performance on compatible Honda/Acura engines. They use a fine-wire iridium center electrode and platinum ground tip for high ignitability and long life, and are supplied pre-gapped with a recommended gap of 0.030 in (0.75 mm). In normal use they deliver consistent spark delivery, good cold-start behavior, and extended service intervals compared with standard copper plugs. The plugs include a crush washer and resistor to reduce radio interference, and their 14 mm hex and M12 x 1.25 thread make installation straightforward with common spark-plug tools. Important practical limits are that the fine-wire electrodes are delicate when re-gapping, so use the recommended gap tool and avoid bending electrodes; also these are vehicle-specific replacements so confirm the part number before ordering. For reliability-focused owners wanting a long-lasting, factory-grade ignition part, these match OEM-style performance without upgrades like multi-electrode or specialty racing designs.
Best for: A buyer prioritizing long-term reliability and factory-like performance who wants a direct replacement that restores original ignition behavior with minimal fuss.
Less Ideal for: Drivers seeking performance-tuned or race-oriented spark plugs with different heat ranges or multi-electrode designs should consider specialized aftermarket options instead.
- Iridium center electrode and platinum ground tip for longer service life and stable ignitability
- Pre-gapped to factory-recommended spacing to simplify installation
- Factory-equivalent fit and thread (M12 x 1.25) for direct replacement
- Includes resistor and crush washer to control interference and ensure proper sealing
- Fine-wire electrodes are fragile and require careful handling when measuring or adjusting gap
Verdict: Choose these NGK Laser Iridium plugs if you want a dependable, factory-grade replacement that prioritizes long life and consistent ignition performance.
5. NGK Iridium IX Spark Plug LKAR7BIX-11S, 4 Pack
| Core Material | Iridium |
|---|---|
| Thread Size | M14 x 1.25 |
| Vehicle Service Type | Car, Truck |
| Position | Front, Rear |
The NGK Iridium IX LKAR7BIX-11S is a four-pack of iridium-tipped spark plugs built for improved ignitability and durability in modern engines. They use a 0.6 mm laser-welded iridium tip and a tapered ground electrode to deliver a stable, consistent spark that helps smoother throttle response and reduced misfires. The long insulator nose and corrugated ribs reduce fouling and flashover, while trivalent metal plating helps prevent corrosion and seizing during installation and removal. In real-world use these plugs typically replace factory plugs during routine tune-ups and can clear misfire codes and restore responsiveness when worn plugs cause rough idle or sluggish throttle. Installation is straightforward but may require the correct spark-plug socket and careful gapping since the fine tip and pre-set gap can be tighter than some OEM gaps. Most users report noticeable drivability improvements and reliable service, though a small number report early failures, so verifying fitment and inspecting condition at install is prudent.
Best for: Buyers who prioritize reliable ignition performance and smoother throttle response for a 2018–2022 Honda Accord and who value evidence from other owners before committing to a replacement part.
Less Ideal for: Drivers who prefer low-cost disposable plugs for short-term fixes or those unwilling to verify and adjust pre-set gaps during installation should consider alternatives.
- Laser-welded 0.6 mm iridium tip for strong, consistent spark and long life
- Design features to resist fouling and flashover for more reliable starts
- Trivalent plating reduces corrosion and eliminates need for anti-seize during installation
- Common aftermarket choice that often matches factory-quality fit and performance
- Some users report early failures on high-mileage engines which suggests occasional quality variation
- Pre-set gap can be very tight and may require care or a specific socket to re-gap
Verdict: For 2018–2022 Honda Accord owners wanting a durable, factory-quality ignition upgrade that improves throttle response and reduces misfires, these NGK Iridium IX plugs are a dependable choice.
6. autoexact Ignition Coil Packs and Iridium Spark Plugs Kit (Set of 4)
| Included Components | 4 ignition coils, 4 iridium spark plugs |
|---|---|
| Automotive Fit Type | Vehicle Specific Fit |
| OEM Equivalent Part Number | UF781, 3052059B013, CM11124A |
| Manufacturer Warranty | 2-Year Manufacturer Warranty |
This kit pairs four ignition coils with four pre-gapped iridium spark plugs designed to replace the factory components on compatible Honda and Acura 1.5L and 2.0L engines. Intended for whole-set replacement, the iridium plugs are fine-wire and rated for long life while the coils use epoxy potting and heat-resistant materials to maintain consistent spark under load. Installation is plug-and-play for owners comfortable with basic hand tools and follows factory torque guidance, so you can DIY and avoid dealer labor. In use the kit aims to eliminate misfires, rough idle, and associated check-engine codes while improving throttle response and fuel economy by restoring full combustion. The product is backed by testing and a two-year warranty plus lifetime support, which suits buyers who want a low-risk swap. Limitations: this is a vehicle-specific fit so confirm exact model and engine before buying, and replacing the whole set is recommended rather than swapping a single failed coil to maintain balanced performance.
Best for: Buyers who want a reliable, low-risk replacement set to restore smooth idle and combustion on compatible Honda or Acura 1.5L and 2.0L engines and prefer a DIY install with factory-fit parts.
Less Ideal for: Shoppers who need a single coil or plug replacement, who have unlisted engine variants, or who prefer performance-tuned ignition parts are better off with other options.
- Complete kit includes four ignition coils and four pre-gapped iridium spark plugs for a matched replacement
- Pre-gapped iridium plugs and epoxy-potted, heat-resistant coils aimed at longer life and stable spark delivery
- Direct vehicle-specific fit and plug-and-play installation for DIY with basic tools
- Designed to reduce misfires, rough idle, and improve throttle response and fuel economy
- Backed by voltage and sealing testing plus a two-year warranty and lifetime support
- Fitment is specific to listed Honda and Acura 1.5L/2.0L engines so it will not fit other engine variants
Verdict: A full set replacement that offers a factory-fit, longer-life iridium plug and upgraded coil combination to reliably eliminate misfires and restore smooth performance on compatible Honda and Acura 1.5L/2.0L engines.
Choosing the Right 2018-2022 Honda Accord Spark Plug: Key Factors to Consider
Correct Heat Range
Heat range determines how quickly a spark plug dissipates combustion heat and is central to preventing pre-ignition or fouling. For the 2018-2022 Honda Accord, matching the factory-recommended heat range helps avoid carbon build-up during short trips and prevents overheating under sustained loads.
Choosing a plug too hot raises the risk of pre-ignition and detonation, which can damage the engine. A plug that is too cold will foul faster, causing misfires and rough idle. Consider your typical driving: frequent short commutes favor a slightly colder option within the approved range, while highway-heavy use can tolerate a hotter plug.
Electrode Material and Longevity
Electrode material, such as iridium or platinum alternatives, affects wear rate and long-term performance. Finer electrode tips typically produce a stronger, more focused spark which can improve combustion efficiency and maintain smoother idle over longer intervals.
Higher-grade materials usually justify longer service intervals and more consistent starts, but they must still match Accord specifications. If you plan to drive long intervals between tune-ups, prioritize materials known for slow wear to keep the gap stable and reduce the chance of misfire codes.
Proper Gap and Tolerance
The electrode gap influences spark intensity and needs to be correct for the engine's ignition system. Many replacement plugs come pre-gapped close to factory settings, but variations in shipping or storage can change the gap slightly.
Confirm the recommended gap for your Accord engine and check tolerances before installation. Too-large a gap can overtax the ignition coil, leading to misfires under load, while too-small a gap can weaken combustion efficiency and increase emissions. Also consider whether the plug design accepts field re-gapping without damaging the electrode.
Fitment and Thread Engagement
Correct fitment means the plug's thread diameter, pitch, and reach match the Accord's cylinder head design. Proper thread engagement prevents cross-threading and ensures the correct seating for heat transfer and sealing.
Plugs with the wrong reach can either bottom out or sit too shallow, both causing sealing and cooling problems. Using the correct seat type is also important for torque specifications. Verify the replacement plug's physical specs against the Accord's requirements to avoid installation or engine damage.
Impact on Driveability and Diagnostics
Spark plugs affect idle smoothness, throttle response, and the likelihood of triggering engine codes. A plug that degrades unevenly or has inconsistent firing can lead to intermittent misfires, rough idle, and reduced throttle responsiveness.
Choose plugs that are known to provide steady ignition across temperature ranges to minimize false fault codes and preserve smooth operation. Consider how quickly you want to resolve potential diagnostic issues: plugs that maintain consistent performance make troubleshooting easier and reduce time spent diagnosing intermittent problems.
Installation and Maintenance
Ease of installation matters, especially if you plan to change plugs yourself. Consider plug designs that allow access with common spark plug sockets, require minimal disassembly, and do not need exotic tools or adapters.
Also evaluate recommended torque values and whether anti-seize or specific dielectric compounds are advised. A plug that is simple to gap and install reduces the chance of cross-threading or improper torque, which protects the head and ensures reliable sealing and heat transfer.
Understanding Spark Plug Types and What They Mean for the Accord
Different spark plug constructions, such as iridium-tipped or platinum-tipped designs, trade off durability against initial spark sharpness. For the 2018-2022 Accord, a finer center electrode often improves ignition efficiency and helps sustain smooth idling over many miles.
Consider how these materials behave in everyday driving. Iridium tips typically last longer and hold the gap better, which can reduce the frequency of replacements. Simpler nickel or standard tips may be adequate if you follow a tighter maintenance schedule.
- Iridium and platinum offer greater longevity and stable gaps.
- Standard nickel may cost less but can wear faster under normal use.
- Electrode geometry influences spark energy and combustion stability.
Common Symptoms That Indicate a Spark Plug Issue
Several symptoms point to worn or improperly gapped spark plugs in the Accord. Look for rough idle, reduced acceleration, a drop in fuel economy, or an engine light indicating misfire. Cold-start hesitation or uneven running during warm-up can also signal plug degradation.
Diagnosing begins with visual inspection and checking the gap, but symptoms can overlap with ignition coil or fuel system problems. Use symptoms as a prompt to inspect plugs first, especially if the plugs have extended miles and the vehicle shows intermittent misfires.
- Rough idle or shaking at low RPM
- Engine misfire codes or intermittent loss of power
- Hard starts or longer cranking time in cold conditions
How Spark Plug Heat Range Affects Daily Driving
Heat range governs how hot the plug tip runs in operation. For typical city and highway use in the Accord, staying within the manufacturer's recommended heat range optimizes combustion and minimizes fouling or overheating risks. Adjusting heat range outside that window is rarely necessary for normal owners and can introduce unwanted tradeoffs.
If you frequently tow or perform sustained high-speed driving, discuss slightly different heat preferences with a technician, but avoid out-of-spec choices. Correct heat range selection helps preserve spark integrity and reduces the chance of pre-ignition or deposit build-up.
- Short trips typically favor plugs that shed heat more quickly
- Sustained high-load driving benefits plugs with a hotter range
- Never deviate from thread and reach specs when changing heat range
Routine Inspection and When To Replace
Inspect spark plugs at regular intervals aligned with your maintenance schedule. Look for electrode wear, carbon deposits, oil fouling, or physical damage to the insulator. Consistent dark deposits across plugs usually indicate a rich condition, while uneven deposits may point to ignition or fuel delivery issues.
Replacement intervals depend on electrode material and driving style. Higher-grade materials extend service life, but even long-life plugs should be checked for gap and seating during major services. If you notice persistent misfires or visible degradation, replace the plugs promptly to avoid catalytic converter stress.
- Check for even electrode wear and consistent coloration
- Replace if gaps have widened beyond spec or insulators are damaged
- Investigate underlying causes if one plug fouls sooner than others
Basic Steps to Change Spark Plugs on an Accord
Changing spark plugs on the 2018-2022 Accord follows a straightforward sequence: allow the engine to cool, remove ignition coil packs, clean the plug wells, and use a torque wrench for proper installation. Keep extension length and socket clearance in mind to avoid contact with surrounding components.
Always verify the correct plug gap and thread engagement before final torque. If you plan to gap plugs yourself, use a feeler gauge and be cautious with fine electrodes to avoid bending or damaging the tip. Finish by reconnecting coils and clearing any misfire codes after a test drive.
- Let engine cool fully before starting
- Remove coils carefully to avoid damaging boots
- Use a torque wrench and follow specified torque values
Troubleshooting Persistent Misfires After Replacement
If misfires continue after installing new plugs, recheck gap, torque, and coil condition. A misfire may stem from an installation issue, degraded ignition coils, wiring faults, or fuel delivery irregularities rather than the plugs themselves.
Systematic troubleshooting helps isolate the cause. Swap a suspect coil to another cylinder, confirm good compression, and inspect plug wells for oil or coolant intrusion. Addressing root causes avoids repeated plug replacements and protects engine components from prolonged misfiring.
- Re-verify plug gap and torque
- Test coils by swapping or using a meter
- Check for oil or coolant in plug wells that indicate bigger issues
Still looking for the perfect fit?
Select your Honda Accord configuration to see the most relevant Spark Plugs recommendations
How We Chose the Best 2018-2022 Honda Accord Spark Plug
We prioritized spark plugs that meet the factory specifications for the 2018-2022 Honda Accord and that offer proven durability under the Accord's typical operating conditions. Evaluation criteria included correct heat range to suit both daily driving and occasional spirited use, electrode construction and material for longevity, and confirmed fitment and thread engagement to prevent installation issues.We also considered resistance and firing consistency, which affect idle quality and cold-start behavior, plus the typical service interval and ease of gap adjustment where applicable. Installation factors such as required socket access and whether a torque-controlled install is needed were included to reflect real-owner experience.Exclusions: we excluded any plugs that do not match the Accord's thread size, seat type, or recommended reach, as well as one-off specialty racing plugs unsuited to street use. The final list emphasizes options that balance longevity, ignition performance, and straightforward installation for Accord owners.
Our full evaluation process is outlined in our review methodology.
FAQ
How often should I replace spark plugs on a 2018-2022 Accord?
Replacement intervals depend on plug material and driving habits. Iridium or platinum plugs often last longer and may be inspected at major service intervals, while standard plugs require more frequent checks. Regular inspection at recommended service milestones helps determine exact timing.
Can I gap new spark plugs myself for the Accord?
Yes, you can gap plugs with a feeler gauge, but be gentle with fine iridium tips. Many modern plugs come pre-gapped close to factory specs, so verify rather than dramatically adjust the gap to avoid damaging electrodes.
What causes a cold-start misfire in an Accord if the plugs are new?
Cold-start misfires can result from incorrect gap, weak ignition coils, fuel system issues, or sensor faults rather than the plugs alone. If new plugs do not resolve the symptom, check coil function and fuel delivery or diagnostic trouble codes to pinpoint the cause.
Does spark plug heat range change with engine tuning or modifications?
Altering engine tuning or adding performance modifications can change combustion temperatures and may affect ideal heat range. Any change should be approached cautiously and remain within the physical fitment and reach required by the Accord's cylinder head design.
Will using longer-life plugs reduce maintenance time for the Accord?
Longer-life plugs like iridium or platinum can extend intervals between replacements, which reduces maintenance frequency. However, they do not eliminate the need for periodic inspection, especially if you experience driveability changes or diagnostic codes.
Should I use anti-seize on spark plug threads?
Follow the vehicle manufacturer's guidance. Many modern plugs come with coatings and manufacturer torque specs assume no additional anti-seize. Using anti-seize can alter torque readings and thread engagement, so apply it only if explicitly recommended.
Final Verdict
When choosing spark plugs for a 2018-2022 Honda Accord, prioritize correct heat range, verified fitment, and electrode materials that match your expected service interval. Focus on plugs that hold the gap, provide consistent firing across temperatures, and are straightforward to install with standard tools.Balance longevity against how often you want to perform maintenance and pay attention to symptoms like rough idle or misfires as signals to inspect plugs and ignition components. Selecting plugs that align with these priorities will maintain smooth running and reliable starting for your Accord.
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