---
product_id: 13136566
title: "Denso (3426) FK20HR-11 Iridium Long Life Spark Plug, Pack of 1"
brand: "denso"
price: "€ 42.60"
currency: EUR
in_stock: true
reviews_count: 13
category: "Denso"
url: https://www.desertcart.sk/products/13136566-denso-3426-fk20hr-11-iridium-long-life-spark-plug-pack
store_origin: SK
region: Slovakia
---

# Extra long life durability 0.5mm Iridium fine wire electrode 0.7mm platinum needle-tipped ground electrode Denso (3426) FK20HR-11 Iridium Long Life Spark Plug, Pack of 1

**Brand:** denso
**Price:** € 42.60
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your drive with precision and longevity!

## Quick Answers

- **What is this?** Denso (3426) FK20HR-11 Iridium Long Life Spark Plug, Pack of 1 by denso
- **How much does it cost?** € 42.60 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/13136566-denso-3426-fk20hr-11-iridium-long-life-spark-plug-pack)

## Best For

- denso enthusiasts

## Why This Product

- Trusted denso brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Endurance That Outlasts:** Engineered for extra long life, these plugs deliver reliable performance beyond 100,000 miles—less hassle, more drive time.
- • **Toyota Spec-Correct Fit:** Perfectly tailored for Toyota models, guaranteeing seamless installation and peak engine compatibility.
- • **Enhanced Fuel Efficiency:** Improved combustion efficiency means better mileage and reduced emissions—drive smarter, not harder.
- • **Trusted by Professionals:** Top-rated with 4.5 stars from 284 reviews, this spark plug is the go-to upgrade for discerning car enthusiasts.
- • **Precision Ignition Performance:** Ultra-fine 0.5mm iridium center electrode ensures optimal spark for smoother acceleration and stable idle.

## Overview

The Denso FK20HR-11 Iridium Long Life Spark Plug features a 0.5mm fine wire iridium center electrode and a 0.7mm platinum needle-tipped ground electrode, designed for exceptional durability and performance. Engineered to meet Toyota specifications, it offers over 100,000 miles of reliable ignition, enhancing acceleration, idle stability, and fuel efficiency for a smoother, more efficient driving experience.

## Description

Denso (3426) FK20HR-11 Iridium Long Life Spark Plug, Pack of 1

Review: Iridium Toyota spec-correct - Very good. 109,000 miles first spark plug change. 😵‍💫
Review: Brought My Corolla Back to Life - After having my mechanic install these spark plugs in my 2006 Toyota Corolla, the car runs noticeably better. Acceleration feels smoother, and the idle is much more stable than before. I didn’t realize how much of a difference new plugs could make until now. It's a small investment with a big impact on performance. If your car’s been feeling a bit sluggish, I highly recommend giving these a try. Worth every cent!

## Features

- Denso # 3426
- Extra Long Life Iridium Plug
- 0.5 mm Fine Wire Iridium Center Electrode
- 0.7 mm Platinum Needle Tipped Ground Electrode

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002FOF1QW |
| Automotive Fit Type | Vehicle Specific Fit |
| Batteries | Lithium Metal batteries required. |
| Best Sellers Rank | #102,636 in Automotive ( See Top 100 in Automotive ) #17 in Automotive Performance Spark Plugs #1,797 in Automotive Ignition Parts |
| Brand | Denso |
| Core Material | Iridium |
| Customer Reviews | 4.5 4.5 out of 5 stars (284) |
| Date First Available | June 25, 2009 |
| Exterior | Machined |
| Global Trade Identification Number | 00042511034266 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.76 ounces |
| Item model number | FK20HR-11 |
| Manufacturer | Denso |
| Manufacturer Part Number | 3426 |
| Model | Spark Plug |
| OEM Part Number | 415237010 |
| Position | Center |
| Product Dimensions | 3.62 x 0.98 x 0.98 inches |
| Thread Size | 14mm x 1.25mm |
| Top Material Type | Metal |
| UPC | 042511034266 |
| Vehicle Service Type | Car |

## Product Details

- **Brand:** Denso
- **Core Material:** Iridium
- **Thread Size:** 14mm x 1.25mm
- **Top Material Type:** Metal
- **Vehicle Service Type:** Car

## Images

![Denso (3426) FK20HR-11 Iridium Long Life Spark Plug, Pack of 1 - Image 1](https://m.media-amazon.com/images/I/613eAfT+1PL.jpg)

## Questions & Answers

**Q: This says it's not for a 2014 v6 toyota highlander but my owner's manual says it is. who is correct?**
A: I just took some pictures from a different website, I bought 6 pieces from, it says this spark plug EXACT FIT my 2015 V6 Highlander LE plus. I don’t know why the product description on Amazon says the other way. It does fit anyway !! 

Speaking of using anti-seize, this is a tricky question. You wanna know how much at where you apply or you don’t apply at all. 

Don’t apply at all meaning once you screw the spark plugs in, using the correct torque, do not take it out again unless you need to replace it. 

How much and where to apply meaning you only wanna apply it like half a water drop, or even less than that, on the middle part of the threads and you wipe it off with a little piece of paper to evenly apply the anti-seize on the middle part of the threads and take out the excessive amount. Yes, it only needs that little. You don’t wanna use too much anti-seize.

These spark plugs are pre-coated and normally you don’t need to apply anti-seize but when you do, pay attention to the torque. You’d then need to apply 20% less on the torque. You absolutely don’t wanna over torque it.

Hope my answer helps.

**Q: This item  denso (3426) fk20hr-11 iridium long life spark plug ,is its new in the box and it look exactly as show in picture ?**
A: Yes

**Q: is this item fit for honda civic 2008 ex 1.8 ?**
A: My electronic catalog data suggests that Denso number 3432 would be correct for your vehicle and engine combination.Bruce

**Q: Will these work on a 2007 Rav4 V6?**
A: Yes they will. That's what I have and they run very well.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Iridium Toyota spec-correct
*by H***R on December 9, 2025*

Very good. 109,000 miles first spark plug change. 😵‍💫

### ⭐⭐⭐⭐⭐ Brought My Corolla Back to Life
*by N***E on August 7, 2025*

After having my mechanic install these spark plugs in my 2006 Toyota Corolla, the car runs noticeably better. Acceleration feels smoother, and the idle is much more stable than before. I didn’t realize how much of a difference new plugs could make until now. It's a small investment with a big impact on performance. If your car’s been feeling a bit sluggish, I highly recommend giving these a try. Worth every cent!

### ⭐⭐⭐⭐⭐ High quality product
*by J***T on May 23, 2025*

OEM performance, but not inexpensive. I guess you get what you pay for. I'm confident I'll get 120K miles out of them, as I did with the original ones.

## Frequently Bought Together

- Denso (3426) FK20HR-11 Iridium Long Life Spark Plug, Pack of 1
- Denso 673-1309 Ignition Coil
- FEL-PRO 61445 Fuel Injection Throttle Body Mounting Gasket for Toyota Highlander

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-13*