---
product_id: 9954120
title: "FXE20HR11 Iridium Long-Life Spark Plugs 3439-4 PK"
brand: "denso"
price: "$187.49"
currency: USD
in_stock: true
reviews_count: 5
category: "Denso"
url: https://www.desertcart.us/products/9954120-fxe20hr11-iridium-long-life-spark-plugs-3439-4-pk
store_origin: US
region: United States of America
---

# 3x longer lifespan than conventional plugs 0.7mm ultra-fine iridium electrode Dual copper & glass seal for gas-tight durability FXE20HR11 Iridium Long-Life Spark Plugs 3439-4 PK

**Brand:** denso
**Price:** $187.49
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your drive with precision and power!

## Quick Answers

- **What is this?** FXE20HR11 Iridium Long-Life Spark Plugs 3439-4 PK by denso
- **How much does it cost?** $187.49 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/9954120-fxe20hr11-iridium-long-life-spark-plugs-3439-4-pk)

## 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

- • **Flashover Fighter:** Unique five-rib insulator design reduces voltage loss and prevents misfires for peak performance.
- • **Endurance Engineered:** Lasts up to three times longer than standard spark plugs—less hassle, more drive.
- • **Factory-Trusted Quality:** Used by luxury automakers like GM, Toyota, and Honda—drive with confidence and prestige.
- • **Thermal Efficiency Boost:** Copper core electrode maximizes heat dissipation, protecting your engine under pressure.
- • **Precision Ignition Mastery:** 0.7mm iridium center electrode for lightning-fast, reliable starts every time.

## Overview

The FXE20HR11 Iridium Long-Life Spark Plugs feature a patented 0.7mm iridium alloy electrode for superior ignitability and longevity, lasting up to three times longer than conventional plugs. Designed with a copper core for enhanced thermal conductivity and a unique five-rib insulator to reduce voltage loss, these plugs ensure reliable, smooth engine performance. Trusted by luxury automakers and backed by a 1-year warranty, they deliver premium quality and durability for cars and trucks.

## Description

Using the same laser welding process as the Iridium Power spark plug, DENSO designed a long life spark plug factory-installed on luxury vehicles by automakers such as GM, Toyota, Honda and Mitsubishi. Using its patented Iridium alloy, DENSO was able to shrink the center electrode to 0.7mm, dramatically improving ignitability and longevity.

Review: Awesome Spark Plugs - I’m very pleased with the plugs I bought at desertcart/AD Auto Parts. When I drove my vehicle I noticed the engine was running a lot smoother and I could feel more power on the engine. This only translates into one thing, Denso iridium long life spark plugs are much better quality than the competition. The price was worth it every penny and my delivery was right on time. Thank you
Review: Denso Spark Plugs - Quality Spark Plugs

## Features

- 100 percent pre-fired to ensure reliable operation
- Copper core center electrode for superior thermal conductivity
- Unique five-rib insulator reduces flashover and decreases voltage loss
- Dual copper and glass seal bonds the center electrode and insulator together for a gas-tight seal.
- Lasts up to three times as long as conventional plugs

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007ZJNZKG |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #1,770,120 in Automotive ( See Top 100 in Automotive ) #8,562 in Automotive Replacement Spark Plugs |
| Brand | Denso |
| Brand Name | Denso |
| Compatible with Vehicle Type | Car, Truck |
| Core Material | Iridium |
| Customer Reviews | 4.8 out of 5 stars 28 Reviews |
| Gap Size | 0.7 Millimeters |
| Global Trade Identification Number | 00042511343948 |
| Included Components | Spark Plugs (4) |
| Item Type Name | Spark Plugs |
| Item Weight | 0.04 Kilograms |
| Manufacturer | Denso |
| Manufacturer Part Number | FXE20HR11 |
| Manufacturer Warranty Description | 1 year manufacturer |
| Model Number | FXE20HR11 (4PK) |
| OEM Equivalent Part Number | MAZDA%1N1918110, NISSAN%224011HC1B, NISSAN%224012331R, NISSAN%22401CK81B, NISSAN%22401CP51B, NISSAN%22401EA014, NISSAN%22401ED815, NISSAN%22401JA01B, NISSAN%22401JD01B, NISSAN%22401JD07B, RENAULT%7701065085, SUBARU%22401EA015 |
| Thread Size | 14mm |
| Top Material Type | Alloy Steel |
| UPC | 042511343948 |
| Unit Count | 1.0 Count |
| Vehicle Service Type | Car, Truck |

## Product Details

- **Brand:** Denso
- **Core Material:** Iridium
- **Thread Size:** 14mm
- **Top Material Type:** Alloy Steel
- **Vehicle Service Type:** Car, Truck

## Images

![FXE20HR11 Iridium Long-Life Spark Plugs 3439-4 PK - Image 1](https://m.media-amazon.com/images/I/51IPZtjtjCL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Awesome Spark Plugs
*by F***Z on September 27, 2024*

I’m very pleased with the plugs I bought at Amazon/AD Auto Parts. When I drove my vehicle I noticed the engine was running a lot smoother and I could feel more power on the engine. This only translates into one thing, Denso iridium long life spark plugs are much better quality than the competition. The price was worth it every penny and my delivery was right on time. Thank you

### ⭐⭐⭐⭐⭐ Denso Spark Plugs
*by D***R on June 9, 2025*

Quality Spark Plugs

### ⭐⭐⭐⭐ Great Plugs
*by R***J on October 4, 2024*

Great spark plugs but cost way to much.

## Frequently Bought Together

- Denso FXE20HR11 Iridium Long-Life Spark Plugs 3439-4 PK
- Beck/Arnley 045-0350 Positive Crankcase Ventilation Valve
- Hitachi IGC0002 Ignition Coil

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**Shop now:** [https://www.desertcart.us/products/9954120-fxe20hr11-iridium-long-life-spark-plugs-3439-4-pk](https://www.desertcart.us/products/9954120-fxe20hr11-iridium-long-life-spark-plugs-3439-4-pk)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-04*