---
product_id: 453276088
title: "Knock Detonation Sensor, Knock Sensor,Car Auto Knock Sensor Fit for Mazda3 Bk 1.4 1.6 2.0 2.3 03-09 Zj01-18-921"
brand: "kuuleyn"
price: "$43.24"
currency: USD
in_stock: true
reviews_count: 7
category: "Kuuleyn"
url: https://www.desertcart.us/products/453276088-knock-detonation-sensor-knock-sensor-car-auto-knock-sensor-fit
store_origin: US
region: United States of America
---

# Easy plug-and-play installation Perfect fit for Mazda3 BK (03-09) Precision-engineered sensor Knock Detonation Sensor, Knock Sensor,Car Auto Knock Sensor Fit for Mazda3 Bk 1.4 1.6 2.0 2.3 03-09 Zj01-18-921

**Brand:** kuuleyn
**Price:** $43.24
**Availability:** ✅ In Stock

## Summary

> ⚡ Tune your Mazda3 to perfection with precision knock detection!

## Quick Answers

- **What is this?** Knock Detonation Sensor, Knock Sensor,Car Auto Knock Sensor Fit for Mazda3 Bk 1.4 1.6 2.0 2.3 03-09 Zj01-18-921 by kuuleyn
- **How much does it cost?** $43.24 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/453276088-knock-detonation-sensor-knock-sensor-car-auto-knock-sensor-fit)

## Best For

- kuuleyn enthusiasts

## Why This Product

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

## Key Features

- • **Precision OEM Match:** Seamlessly replaces original ZJ01-18-921 sensor for flawless compatibility
- • **Tailored for Mazda3 BK:** Specifically engineered for 1.4, 1.6, 2.0, and 2.3L engines (2003-2009)
- • **Effortless Installation:** Designed for quick, hassle-free swap with no modifications needed
- • **Optimized Engine Performance:** Accurately detects engine knock to protect and enhance your ride
- • **Durable High-Quality Material:** Crafted from lightweight, resilient hose material built to last

## Overview

This Kuuleyn knock detonation sensor is a high-accuracy, OEM-spec replacement part designed exclusively for Mazda3 BK models (2003-2009) with 1.4 to 2.3L engines. Made from durable, lightweight hose material, it ensures reliable knock detection to optimize engine performance and longevity. Easy to install and perfectly matched to original factory specifications (OE number ZJ01-18-921), it’s the smart upgrade for maintaining your car’s peak condition.

## Description

Knock Detonation Sensor, Knock Sensor,Car Auto Knock Sensor Fit for Mazda3 Bk 1.4 1.6 2.0 2.3 03-09 Zj01-18-921 : desertcart.co.uk: Automotive

Review: Worked nice - This works fine on mazda 3, 1.6 petrol BL. It also fits for E1T50371 as mine was E1T50371 and had to research enough whether it would fit or not. Works fine.
Review: Afforable compare to other products - It fitted my mazda 3 2008

## Features

- 【Fitment】The knock sensor is fit for Mazda 3 BK 1.4/1.6/2.0/2.3/03-09,please check the product make sure it fits for your car.
- 【OE Part Number】According to the original factory specifications, the sensor perfectly matches your original car,replaceable OE number, for reference:ZJ01-18-921.
- 【Features】The car knock sensor is processed by professional manufacturing, it has high accuracy and durable.
- 【High Quality】The auto knock sensor uses high-quality hose material, which is lighter and more durable.
- 【Easy to Install】The knock sensor is easy to install,it is perfect match to your original car.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08R3YVZRH |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 64,401 in Automotive ( See Top 100 in Automotive ) 7 in Car Engine Detonation Sensors |
| Colour | popular |
| Customer Reviews | 4.7 4.7 out of 5 stars (24) |
| Date First Available | 21 Dec. 2020 |
| Item Package Quantity | 1 |
| Item Weight | 81 g |
| Item model number | Kuuleyn7nfcv3ta1w |
| Manufacturer | Kuuleyn |
| Material | Hose |
| Part number | Kuuleyn7nfcv3ta1w |
| Product Dimensions | 3 x 3 x 3 cm; 81 g |
| Size | normal |
| Specific uses | automotive |

## Product Details

- **Brand:** Kuuleyn
- **Item dimensions L x W x H:** 30 x 30 x 30 millimetres
- **Item weight:** 81 Grams
- **Material:** Hose
- **Measuring range:** 1000 - 6000 RPM

## Images

![Knock Detonation Sensor, Knock Sensor,Car Auto Knock Sensor Fit for Mazda3 Bk 1.4 1.6 2.0 2.3 03-09 Zj01-18-921 - Image 1](https://m.media-amazon.com/images/I/61AVzhqeB0L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked nice
*by R***A on 23 December 2025*

This works fine on mazda 3, 1.6 petrol BL. It also fits for E1T50371 as mine was E1T50371 and had to research enough whether it would fit or not. Works fine.

### ⭐⭐⭐⭐⭐ Afforable compare to other products
*by T***O on 24 September 2024*

It fitted my mazda 3 2008

### ⭐⭐⭐⭐⭐ 6 months and no issues so far
*by L***S on 3 October 2023*

Really cheap compared to others I have seen and no issues to report so far. Knock sensor warning went away

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-09*