NGK Laser Iridium Spark Plugs — Honda Civic 2016–2021 (4-Pack), Iridium Tip & OE‑Equivalent

NGK Laser Iridium spark plugs (Box of 4, ILZKAR8H8S) are high‑performance replacement plugs designed to restore reliable starts, efficient combustion, and extended service life in compatible 2016–2021 Honda Civic engines.

These NGK plugs use an ultra‑fine iridium center electrode and a platinum ground electrode to reduce wear and maintain a stable spark over many miles. Built with a laser‑welded tip, extended insulator nose, corrugated ribs, and a triple‑gasket seal, they target better ignitability, lower fouling risk, and minimized combustion leakage. They’re specified as OE‑equivalent replacements for many L4 2.0L turbo and L4 1.5L Civic configurations (not recommended for Civic Si models).

How do these spark plugs improve starting and throttle response?

The iridium center electrode produces a concentrated, consistent spark that helps ignite the air/fuel mixture more efficiently, especially during cold starts and transient throttle events. Improved ignition reliability typically translates into quicker starts and a more immediate throttle response under load.

• Laser‑welded iridium tip for a stronger, focused spark
• Fine electrode diameter reduces required voltage and improves ignitability
• Stable spark throughout the plug’s service life for consistent performance

Will these plugs reduce fouling and last longer than standard plugs?

Yes — the combination of an extended insulator nose and durable electrode materials lowers the chance of deposits building up and slows electrode wear. NGK’s platinum disc on the ground electrode and iridium center tip are chosen for longevity, helping the plugs hold their gap and function properly for an extended interval.

• Extended insulator nose resists deposit formation
• Platinum disc welded on the ground electrode for long life
• Corrugated insulator ribs prevent flashover and electrical leakage

Are these the correct plugs for my 2016–2021 Honda Civic?

These NGK ILZKAR8H8S plugs are specified as equivalent replacements for many 1.5L and 2.0L Civic engines within the 2016–2021 model years. They match OE performance characteristics for compatible engine codes, but they are not recommended for Civic Si performance variants.

• Fits L4 1.5L and L4 2.0L turbocharged Civic engines (check engine code)
• Manufacturer part number: 95112 — NGK box of four
• Not intended for Civic Si models; verify compatibility before purchase

What construction features help prevent leakage and corrosion?

NGK uses a triple‑gasket sealing system to block combustion gases from bypassing the plug, and trivalent metal plating on the shell reduces corrosion and seizing. The combined design protects the thread area and maintains a secure mechanical and electrical connection over time.

• Triple gasket seal eliminates combustion gas leakage
• Trivalent plating provides anti‑corrosion and anti‑seize protection
• Precision manufacturing ensures consistent thread and seat engagement

Who is this for: These NGK Laser Iridium spark plugs are aimed at Honda Civic owners who want an OE‑equivalent upgrade for reliable ignition, extended interval service, and improved combustion stability. Ideal for drivers of 2016–2021 Civics with the L4 1.5L or L4 2.0L turbo engines who prioritize consistent starts, reduced fouling, and long‑lasting plug life. Confirm your vehicle’s engine specification before ordering to ensure compatibility, and remember this set is not recommended for Civic Si models.