---
product_id: 607419108
title: "Marsflex O2 Oxygen Air Fuel Ratio Sensor 234-9009 Upstream Compatible with Toyota Sienna RAV4 Highlander Camry Avalonn Lexus RX300 ES300, Replacment 250-54054"
brand: "marsflex"
price: "€ 193.56"
currency: EUR
in_stock: true
url: https://www.desertcart.com.cy/products/607419108-marsflex-o2-oxygen-air-fuel-ratio-sensor-234-9009-upstream
store_origin: CY
region: Cyprus
---

# 20s fast response time OE-spec precision fit 16-inch easy install length Marsflex O2 Oxygen Air Fuel Ratio Sensor 234-9009 Upstream Compatible with Toyota Sienna RAV4 Highlander Camry Avalonn Lexus RX300 ES300, Replacment 250-54054

**Brand:** marsflex
**Price:** € 193.56
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your ride’s brainpower with Marsflex O2 Sensor — because every second counts!

## Quick Answers

- **What is this?** Marsflex O2 Oxygen Air Fuel Ratio Sensor 234-9009 Upstream Compatible with Toyota Sienna RAV4 Highlander Camry Avalonn Lexus RX300 ES300, Replacment 250-54054 by marsflex
- **How much does it cost?** € 193.56 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/607419108-marsflex-o2-oxygen-air-fuel-ratio-sensor-234-9009-upstream)

## Best For

- marsflex enthusiasts

## Why This Product

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

## Key Features

- • **Confidence with Coverage:** Backed by a 1-year warranty and rigorous quality testing for peace of mind.
- • **Plug & Play Installation:** 16-inch length and perfect plug match make installation quick and hassle-free.
- • **Rapid Response Technology:** Delivers oxygen level readings in just 20 seconds, ensuring real-time engine adjustments.
- • **Durability Meets Performance:** Crafted from premium materials to extend catalytic converter life and boost fuel efficiency.
- • **Precision Engine Optimization:** Engineered to exact OE specs for seamless compatibility with Toyota & Lexus models.

## Overview

The Marsflex O2 Oxygen Air Fuel Ratio Sensor 234-9009 is a high-quality, OE-spec replacement sensor compatible with key Toyota and Lexus models from 1997-2003. Designed for fast 20-second response times and easy installation, it enhances engine performance, fuel economy, and catalytic converter longevity. Manufactured in the USA and backed by a 1-year warranty, this sensor ensures reliable, real-time air-fuel ratio monitoring to keep your vehicle running at peak efficiency.

## Description

O2 Oxygen Air Fuel Ratio Sensor 234-9009 Upstream Compatible with Toyota Sienna RAV4 Highlander Camry Avalonn Lexus RX300 ES300, Replacment 250-54054

## Features

- 🔧Cautions: Please check your vehicle fitment carefully in the product description to avoid any wrong purchase. Please check your part pictures with our pictures, especially the plug, it must be completely same. Or it will not fit your car
- 🔧Application: Marsflex Oxygen Sensor 234-9009 fit for 1999-2000 Sienna/ 1997-2000 RAV4/ 2001-2003 Highlander/ 1997-2000 Camry/ 1997-1999 Avalonn/ 1999-2003 RX300/ 1997-1999 ES300
- 🔧Advantage: Made of high-quality materials, strong durability, to ensure service life, Marsflex O2 Sensor can improve engine performance and fuel economy,extend Catalytic Converter life
- 🔧Easy Installation: Total length 16 inch. Manufactured to OE specification fit form and function, durable and easy installation
- 🔧Warranty: 1-YEAR WARRANTY. ALL Marsflex oxygen sensors are extensively tested during manufacturing to guarantee quality, reliability, and above all, always meet or exceed the original equipment specifications

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Marsflex |
| Item dimensions L x W x H | 15 x 5.5 x 5.5 Centimeters |
| Item Weight | 0.13 Kilograms |
| Style | Compatible |
| Response Time | 20 Seconds |
| Specific Uses For Product | Oxygen Sensor |
| Manufacturer | Marsmotor |
| Country of Origin | USA |
| Model number | APEL14024 |
| Number of Memory Sticks | 1 |
| Item Weight | 132 g |
| Product Dimensions | 15.01 x 5.51 x 5.51 cm; 132 g |
| Item model number | APEL14024 |
| Item Height | 2.17 Inches |
| Item Width | 2.17 Inches |
| Wattage | 20 Watts |
| Included Components | NO |
| Are batteries included? | No |

## Product Details

- **Brand:** Marsflex
- **Item dimensions L x W x H:** 15 x 5.5 x 5.5 Centimeters
- **Item Weight:** 0.13 Kilograms
- **Style:** Compatible
- **Response Time:** 20 Seconds

## Images

![Marsflex O2 Oxygen Air Fuel Ratio Sensor 234-9009 Upstream Compatible with Toyota Sienna RAV4 Highlander Camry Avalonn Lexus RX300 ES300, Replacment 250-54054 - Image 1](https://m.media-amazon.com/images/I/61ddlGyAFvL.jpg)

## Questions & Answers

**Q: What is the life expectancy of an oxygen sensor?**
A: Heated oxygen sensors should be checked or replaced every 60,000 miles, while unheated oxygen sensors should be checked or replaced every 30,000 miles

**Q: Do I need to replace all of the sensors at once?**
A: It is best to replace O2 sensors in pairs. Because, replacing one sensor will cause the ECU to set a code for the other sensors. This is because the new sensor switching activity is much faster than that of the older aged sensors

**Q: The oxygen sensor will not come out.**
A: If you are using an open end wrench, try an O2 socket. If this fails, try a long ratchet or breaker bar in conjunction with your socket to generate more torque. After the sensor is removed, be sure to use a thread cleaner to clean up the bung threads

**Q: Why does the fault code still exist after replacing the oxygen sensor?**
A: 1 Oxygen sensor circuit failure

**Q: Will this oxygen sensor work with my vehicle?**
A: Marsflex oxygen sensor is consistent with OEM, please refer to the page information for compatibility information. You can check 'Amazon confirmed it' for confirmation, or provide us with your vehicle information and we will confirm it for you.

## Frequently Bought Together

- Marsflex Air Fuel Ratio O2 Oxygen Sensor 234-9009 Upstream Compatible with Toyota Sienna Highlander Camry Avalon Lexus RX300 ES300, Replacement 250-54054
- Offset Oxygen Sensor Socket, 3/8-Inch Drive, 7/8-Inch (22mm), Wire Gate Accesses Sensor from Side, Preventing Damage to Wires, Universal for Most Cars
- Marsflex Oxygen O2 Sensor 234-4622 13355 Downstream Heated Compatible with Toyota Camry Avalon Sienna 4Runner RAV4 Solara Matrix Lexus ES300 Pontiac Vibe,250-24360 Replacement

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-02-14*