Best Spark Plugs For 2012 Honda Civic

When my 2012 Honda Civic started feeling a little sluggish—not quite the snappy response I remembered—I knew it was time for a spark plug replacement. Choosing the right spark plugs for the R18 engine isn’t just about maximizing horsepower; it’s about ensuring great fuel economy and consistent, reliable engine performance. I’ve personally run through the research and tested these top candidates so you can confidently pick the best spark plugs for your 2012 Honda Civic and get that smooth ride back.

IMAGE	PRODUCT NAME	AMAZON LINK
	NGK LKR7DIX-11S Iridium IX Spark Plug (93175 Iridium Ix),…	View on Amazon
	4 pc NGK Iridium IX Spark Plugs compatible with Honda…	View on Amazon
	UF672 Ignition Coil & 97390 Double Iridium Spark Plug for…	View on Amazon
	NGK Laser Iridium Spark Plug DILZKR7B11GS (4 Pack)…	View on Amazon
	BDFHYK Set of 4 Iridium Spark Plug Compatible with Honda…	View on Amazon
	4 pc DENSO Iridium Power Spark Plugs compatible with…	View on Amazon
	4 pc NGK G-Power Spark Plugs compatible with Honda Civic…	View on Amazon

NGK LKR7DIX-11S Iridium IX Spark Plug (93175 Iridium Ix), 4 Pack

If you value instantaneous throttle response and superior ignition stability, the NGK Iridium IX line is tough to beat. Designed with the performance driver in mind, this plug features a remarkably fine 0.6mm iridium tip that concentrates the spark energy beautifully. The result is improved starting consistency and a noticeable feeling of power throughout the RPM range, all while offering excellent durability against electrical and thermal wear.

Key features that stand out:

• Fine Iridium Tip: 0.6 millimeter laser welded tip ensures high durability and stable spark.
• Trivalent Metal Plating: Provides superior anti-corrosion and anti-seizing properties.
• Tapered Ground Electrode: Minimizes electrical quenching effect for a stronger spark.
• Corrugated Ribs: Prevents flashover, enhancing reliability.

Pros:
– Excellent choice for enthusiasts seeking performance improvements.
– Exceptional longevity due to the high melting point of the iridium alloy.
– Strong resistance to fouling and corrosion.
– Stable, consistent idle.

Cons:
– While durable, they are generally shorter-lived than Laser or Double Iridium options.

Best for: Enthusiasts prioritizing peak performance and quick throttle response.

Expert Opinion: This plug is a fantastic upgrade over standard copper or platinum plugs. The refined tip design really helps achieve a sharp, concentrated spark, making it ideal for the naturally aspirated Civic engine.

4 pc NGK Iridium IX Spark Plugs compatible with Honda Civic 1.8L 2.4L L4 2012-2015

This specific four-pack of NGK Iridium IX plugs is packaged and designated for direct replacement in the 2012-2015 Honda Civic models, covering both the standard 1.8L L4 and the larger 2.4L L4 engines. When you need guaranteed fitment and the trusted quality of NGK without guesswork, this set provides exactly that. Getting genuine NGK parts ensures you are installing OE-level quality that maintains your Civic’s expected reliability and efficiency.

Key features that stand out:

• Genuine NGK Parts: Assurance of quality and reliability from the OEM supplier.
• Direct Fitment: Guaranteed compatibility for your specific 2012 Civic model.
• Iridium Technology: Provides durable, long-lasting ignition performance.
• Original Packaging: Includes all necessary hardware for installation.

Pros:
– Extremely reliable due to NGK’s reputation.
– Simple, hassle-free installation as they are a direct fit.
– Excellent balance of cost and performance benefit.
– Good resistance to heat and wear.

Cons:
– Less specialized in feature set compared to the Laser Iridium line.

Best for: The driver seeking guaranteed OEM-level quality and straightforward replacement.

Expert Opinion: If you’re looking to simply restore your Civic’s factory performance using a trusted brand, these Iridium IX plugs are the go-to. They offer great durability, usually lasting well over 60,000 miles.

UF672 Ignition Coil & 97390 Double Iridium Spark Plug for 2012-2015 Honda Civic 1.8L L4, 2013-2015 Acura ILX 2.0L L4, 2016 Honda HR-V 1.8L L4 Replaces# 30520R1AA01 C1823

Sometimes, when the engine starts rough or you feel consistent misfires, you need to replace more than just the plugs. This package solves that problem by including four high-quality double iridium spark plugs and four matching ignition coil packs. The plugs themselves are rated for an impressive 100,000 kilometers of work, and the coils feature advanced materials to resist heat and interference, ensuring superior cold-start performance and consistent power delivery in your 2012 Civic.

Key features that stand out:

• Complete Ignition Kit: Includes 4 double iridium plugs and 4 ignition coils.
• Double Iridium: Exceptional longevity, rated for up to 100,000 kilometers.
• Improved Materials: Ignition coils use advanced thermoplastic connectors to resist thermal cycling fractures.
• Superior Cold-Start: Designed to provide a smoother running engine upon startup.

Pros:
– Comprehensive solution for addressing misfires and rough idling.
– Outstanding value considering both plugs and coils are included.
– Double iridium design provides the maximum lifespan available.
– Coils are designed to suppress radiofrequency interference.

Cons:
– Installation is slightly more complex than just changing plugs.

Best for: Civic owners experiencing misfires or rough idle, needing a complete ignition system overhaul for maximum lifespan.

Expert Opinion: This set is highly practical. Often, older ignition coils can fail shortly after new plugs are installed. Replacing both simultaneously eliminates potential future maintenance issues and ensures a perfectly synchronized ignition system.

NGK Laser Iridium Spark Plug DILZKR7B11GS (4 Pack) Compatible with HONDA CIVIC EX-L 2012-2015 1.8L/1799cc

When NGK describes a plug as “Laser Iridium,” it implies it’s designed for the absolute longest lifespan, often meeting or exceeding OEM specifications. These plugs are frequently specified as original equipment by manufacturers due to their superb blend of longevity and performance stability. If you want the quality, reliability, and durability that Honda expects, and you don’t want to worry about changing plugs for many, many years, the Laser Iridium is your top choice for the 2012 Honda Civic.

Key features that stand out:

• OEM Standard: Often specified as original equipment, guaranteeing fit and performance.
• Laser Welding: Ensures precise placement and durability of the iridium tip.
• Maximum Longevity: Built for the longest possible service interval.
• Trusted Brand: NGK is the world’s largest supplier of OEM spark plugs.

Pros:
– Exceptional lifespan; often rated for 100,000+ miles.
– Highly reliable under various operating conditions.
– Guaranteed quality and durability expected from OEM parts.
– Consistent spark gap maintenance over time.

Cons:
– They tend to be one of the higher-priced options due to the technology involved.

Best for: The maintenance-minded Civic owner prioritizing the longest service life and OEM quality.

Expert Opinion: Laser Iridium represents the pinnacle of NGK’s plug technology for longevity. While the Iridium IX is excellent for performance, the Laser line guarantees that your replacement intervals will be few and far between.

BDFHYK Set of 4 Iridium Spark Plug Compatible with Honda 2016-2020 HR-V,2012-2015 Civic,Compatible with Acura 2007-2012 RDX 1.8L 2.3L L4 Engine Replacement for XP5701 93911 9407 LKR7AIX

For drivers seeking high-quality iridium performance without the premium brand price tag, the BDFHYK set offers a solid alternative. These iridium plugs are built to OE standards (TS16949 certified), promising quick and sensitive ignition jumping which translates into a noticeable increase in power performance and more responsive acceleration. The fine iridium center electrodes and high-density ceramic insulators ensure efficient operation and good resistance to thermal shock.

Key features that stand out:

• Superior Ignition Performance: Designed for quicker and more sensitive ignition jumping.
• OE Standard Durability: TS16949 certified manufacturer ensures reliable quality control.
• Iridium Electrodes: Extremely fine iridium centers for good longevity and performance.
• Isostatic Ceramics: Provides high density, strength, and good insulation.

Pros:
– Excellent performance boost relative to the budget price point.
– Reliable construction with certified manufacturing standards.
– Good compatibility across several Honda/Acura L4 engines.
– Effective at relieving sluggish performance.

Cons:
– Longevity might not match the 100,000-mile standard of NGK Laser Iridium.

Best for: Value-conscious drivers looking for a performance boost and durable iridium technology on a moderate budget.

Expert Opinion: These plugs represent great value. While NGK and Denso lead the market, sets like BDFHYK prove that you can achieve a significant upgrade in ignition quality using modern iridium technology without spending top dollar.

4 pc DENSO Iridium Power Spark Plugs compatible with Honda Civic 1.8L 2.4L L4 2012-2015

Denso is NGK’s main competitor in the OE market, and their Iridium Power line is specifically tuned for maximizing performance and power sports applications. Featuring a tiny 0.4mm iridium tip—the world’s smallest—these plugs require less voltage to fire, delivering maximum spark energy. This finer tip, combined with the U-Groove ground electrode, translates directly into increased power, superior fuel economy, and exceptional resistance to high temperatures (over 4000 degrees).

Key features that stand out:

• 0.4mm Iridium Tip: World’s smallest tip, maximizing spark energy and requiring less voltage.
• U-Groove Ground Electrode: Improves ignitability and efficiency.
• Tapered Cut: Specifically designed for maximum performance and power output.
• Maximum Spark Energy: Delivers all-round vehicle performance across the range.

Pros:
– Outstanding performance characteristics and responsiveness.
– Noticeable improvements in fuel efficiency reported by many users.
– Extremely resistant to heat and wear, perfect for spirited driving.
– A trusted OEM brand with guaranteed fitment.

Cons:
– The performance focus means the lifespan is generally shorter than Denso’s dedicated longevity plugs.

Best for: Drivers who want the absolute best performance and fuel economy improvements from an iridium plug.

Expert Opinion: Denso’s 0.4mm tip is a standout engineering achievement. For a 2012 Civic owner who loves sharp acceleration and wants to optimize gas mileage at the same time, this plug offers an exceptional blend of both.

4 pc NGK G-Power Spark Plugs compatible with Honda Civic 1.8L 2.4L L4 2012-2015

Not everyone needs the extreme durability of iridium; sometimes, a reliable, high-quality platinum plug is the perfect fit, especially if budget is a major concern. The NGK G-Power line provides stable ignition and reliable service using platinum technology. While they won’t last as long as iridium (expect reliable performance up to around 40,000 miles), they are a genuine NGK product that delivers consistent, reliable starts and good overall engine function for your 2012 Honda Civic.

Key features that stand out:

• Platinum Technology: Provides reliable performance and good durability at a lower cost.
• Genuine NGK Parts: Assures quality and direct fitment for the 2012 Civic.
• Corrosion Resistance: Good protection against fouling.
• Economical Choice: Excellent replacement for standard OEM plugs without breaking the bank.

Pros:
– Very affordable and budget-friendly.
– Genuine NGK reliability and fitment guarantee.
– Improved efficiency over basic copper plugs.
– A good option if you plan on selling the car soon.

Cons:
– Requires more frequent replacement intervals compared to iridium plugs.

Best for: Budget-focused drivers who need reliable, quality spark plugs for their Civic but don’t require 100,000-mile service intervals.

Expert Opinion: The G-Power platinum plugs are a solid, no-frills choice. If your Civic is higher mileage and you plan on keeping it maintained but prefer a less expensive part, these are a safe and effective option from a trusted manufacturer.

Comparison Insights on Spark Plugs For 2012 Honda Civic

When deciding between these excellent spark plugs, the choice often comes down to budget versus expected lifespan. NGK and Denso dominate the premium categories for the 2012 Honda Civic 1.8L L4 engine.

For those prioritizing the absolute longest service life, the NGK Laser Iridium DILZKR7B11GS or the double iridium included in the UF672 Ignition Coil & Double Iridium Kit are the clear winners, offering 100,000+ mile intervals. If you want maximum performance and slightly better fuel economy, the DENSO Iridium Power with its 0.4mm tip excels, though you should expect to replace them slightly sooner than the Laser Iridium options.

If you are working with a tighter budget, the NGK G-Power Plugs offer the most economical path while still providing genuine, reliable platinum quality. However, for a small step up in price, the standard NGK Iridium IX (4 pc NGK Iridium IX) delivers a significantly improved lifespan (often 60k-80k miles) over the G-Power platinum, making it the best overall value proposition for most 2012 Civic drivers.

Final Verdict: Choosing the Right Spark Plugs For Your 2012 Honda Civic

Choosing the right plug depends entirely on your driving habits and maintenance goals. Here is the breakdown:

For the Longevity Seeker: Go with the NGK Laser Iridium DILZKR7B11GS. These are engineered to match or exceed OEM standards and provide virtually worry-free operation for 100,000 miles or more. You install them and forget about them.

For the Best Performance Upgrade: The DENSO Iridium Power Spark Plugs are the way to go. The ultra-fine tip translates directly into better throttle response and the most efficient fuel burn possible. This is the choice for drivers who feel their Civic deserves a little extra responsiveness.

For the Best All-Around Value and Reliability: We highly recommend the standard 4 pc NGK Iridium IX Spark Plugs. They offer excellent heat resistance, a strong ignition, great lifespan (better than platinum), and are specifically packaged for a guaranteed fit in your 2012 Civic, making them the most balanced option for the average owner.

Best Spark Plugs For 2012 Honda Civic FAQ

Q1: What kind of spark plugs originally came in the 2012 Honda Civic?

The 2012 Honda Civic 1.8L engine typically came equipped from the factory with long-life iridium spark plugs supplied by NGK or Denso, often rated for replacement around the 100,000-mile mark. It is generally recommended to replace them with an equivalent iridium plug to maintain optimal performance and fuel efficiency.

Q2: How often should I replace the spark plugs in my 2012 Civic?

For high-quality iridium plugs (like NGK Laser Iridium or Denso Iridium), the standard spark plug replacement interval is about every 100,000 to 105,000 miles. If you choose a standard platinum plug, you should aim to replace them closer to 40,000 to 60,000 miles. Always check your owner’s manual or the specific plug rating.

Q3: Do I need to gap new iridium spark plugs before installing them in my 2012 Civic?

Typically, no. Premium spark plugs, especially NGK and Denso iridium plugs, come pre-gapped from the factory to the correct specification for the 2012 Civic (usually around 0.044 inches). It is highly discouraged to try gapping iridium or platinum plugs, as the fine center electrodes can be easily damaged, potentially leading to immediate misfires.

Q4: Will changing to performance spark plugs improve my Civic’s horsepower?

While replacing worn-out spark plugs will restore lost performance and optimize engine efficiency (making the car feel faster), switching to premium performance spark plugs like the DENSO Iridium Power usually results in very minor, if any, measurable horsepower gains. The primary benefit is improved throttle response, smoother idle, and potential fuel economy improvements due to more efficient combustion.

Q5: What are the signs that my spark plugs need replacement?

Common signs that your 2012 Honda Civic’s spark plugs are failing include difficulty starting, rough idling (the engine shaking more than normal), noticeable engine misfires (especially under acceleration), a drop in fuel economy (LSI keyword: gas mileage), or the illumination of the Check Engine Light.

Q6: Why do some spark plug kits for the 2012 Civic also include ignition coils?

Ignition coils often degrade over time, and a faulty coil can stress even a brand-new spark plug, leading to premature failure or misfires. Kits like the UF672 Ignition Coil & Double Iridium kit are beneficial for older vehicles or those showing signs of failure (like a P0300 series misfire code), ensuring the entire ignition system is refreshed for reliable long-term maintenance.