Honda uses spark plugs from multiple manufacturers, with NGK and Denso as the most common suppliers across its lineup as of 2024-2025. The exact plug type and replacement part number depend on the model, engine family, and market.
Across its lineup, Honda does not mandate a single plug. This article explains how to identify the right plug for your vehicle, what kinds of plugs are typically used in different engines, and how to source the correct part.
Honda's approach to spark plugs
Honda designs each engine to work with a specific spark plug configuration, rather than enforcing one universal model for all cars. In practice, this means the recommended plug is chosen based on the engine’s combustion chamber design, ignition system, and heat range. The two primary OEM suppliers you will encounter are NGK and Denso, though regional variations can occur.
Two main OEM suppliers
In most markets, NGK and Denso provide the spark plugs listed as recommended or acceptable replacements in Honda’s official catalogs. Dealers and service centers commonly stock both brands to cover the variety of engines in circulation.
- NGK: Iridium IX and other standard options, depending on the engine type and model year.
- Denso: Iridium Power and other premium variants used on a range of Honda engines.
- Other brands: Occasionally Honda-approved alternatives appear in specific markets, but NGK and Denso dominate the OEM-supply landscape.
Always consult the official service information for your exact vehicle to confirm the recommended plug brand and part number for your engine.
How to identify the right spark plug for your Honda
Use a methodical approach to verify which spark plug your car needs. The steps below help ensure you source the correct part and maintain engine performance.
Before you start, gather your vehicle details and plan to check both official manuals and parts catalogs.
- Check your owner's manual or service manual for the recommended spark plug type and any engine-specific notes.
- Match your engine code/serial number to the official Honda parts catalog, which lists compatible NGK and Denso part numbers.
- Compare part numbers and cross-reference with NGK and Denso catalogs to find equivalents and ensure heat range, thread size, and reach match.
- Consult a dealer or trusted shop if you are unsure, especially for high-mileage cars or performance variants.
Following these steps helps avoid using an incorrect heat range or reach that could affect starting, idle stability, or longevity.
Common plug types used in Honda engines
Across Honda's diverse engine lineup, a few plug technologies appear most often. The selection typically depends on the engine's design and the desired service interval.
- Iridium plugs (e.g., Iridium IX from NGK or Iridium Power from Denso) for long-life performance and reliable ignition in modern engines.
- Platinum plugs for mid-life replacement intervals on a range of older or budget applications.
- Copper-core plugs on legacy engines or applications where the heat range and price balance are a priority.
Newer Honda engines frequently favor iridium or platinum long-life plugs, which help with efficient burning and longer replacement intervals.
Where to find the official part numbers
To avoid confusion, always rely on official Honda resources or a licensed parts catalog. You will typically find two families of part numbers: NGK and Denso equivalents, with parity in most markets.
- Visit Honda’s official parts catalogs or contact a local dealer to pull the exact OEM part number for your VIN.
- Use independent catalogs that show cross-references between NGK and Denso part numbers for your engine, model year, and market.
- Ask a technician to verify the heat range, thread size, and reach to ensure proper fitment.
Having the right number ensures correct heat range and electrode configuration for your Honda engine and avoids misfiring or starting issues.
Summary
Honda does not rely on a single spark plug model across its entire lineup. The brand’s engines typically use plugs from NGK or Denso, with the exact part number determined by engine design and market. Modern Hondas commonly employ iridium or platinum plugs for longer life, while older or budget models may use copper-core or platinum variants. Always verify the correct spark plug with the owner's manual or a Honda dealership’s parts catalog to ensure proper fitment and warranty compliance.