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Marsflex Air Fuel Ratio O2 Oxygen Sensor 234-9009 Upstream Compatible with Toyota Sienna Highlander Camry Avalon Lexus RX300 ES300, Replacement 250-54054

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$37.99

$ 16 .99 $16.99

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About this item

  • 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 Toyota 1997-1999 Avalon XLS/XL 1998 Camry CE 1998-2000 Camry LE/XLE 1999-2000 Sienna CE/LE/XLE 1999-2000 Solara SE/SLE 2001-2003 Highlander Limited/Base, Lexus 1998-1999 ES300 Base, 1999-2003 RX300 Base
  • Durable and Reliable: Marsflex O2 sensors feature aerospace-grade stainless steel housing & high-temp ceramic core (-40℃~950℃ resistance). Laser-sealed IP67 protection withstands dust/water. Rigorously tested (10,000hrs + 500 thermal cycles) with anti-interference chip for precise signals. 80,000-100,000km lifespan, backed by12-month warranty. Proven durability worldwide!
  • Easy Installation: Total length 15.7 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
  • Improve Fuel Economy: Marsflex oxygen sensor helps optimize fuel efficiency by providing accurate real-time data to your engine’s ECU, ensuring the ideal air-fuel ratio (14.7:1). Over time, old sensors degrade, causing incorrect fuel mixtures (too rich or too lean). Replacing them with a high-precision Marsflex sensor restores proper combustion, potentially improving fuel economy by 5-15% while reducing emissions. For best performance, we recommend replacement every 60,000–80,000 km



Product Description

Oxygen sensor 234-9009
o2 sensor 234-9009
fitment 234-9021
Replace oxygen sensor
Oxygen sensor notice
  • 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

  • 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

  • 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

  • 1 Oxygen sensor circuit failure

    2 The mixture is too rich

    3 The mixture is too lean

    4 The three-way catalytic converter is damaged or fails

    5 Damaged ECM

  • 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.


WillNickT
Reviewed in the United States on February 17, 2025
Perfect fot for my 01 Lexus rx300. I noticed an immediate difference, and I have zero complaints. Definitely recommended.
DMC
Reviewed in the United States on February 10, 2025
Arrived promptly, exact replacement, so far no more check engine light
Zack H.
Reviewed in the United States on September 1, 2024
Couldn't afford an OEM sensor at the time. Worked for about 6 months before the light came back. Went with an OEM sensor.
jacky
Reviewed in the United States on March 31, 2024
It took a week and performed well
Jerry Lamascus
Reviewed in the United States on November 17, 2024
Works as intended
toybiz
Reviewed in the United States on October 10, 2024
My 2003 Toyota Highlander with 180,000 miles finally killed one of the O2 sensors and rather than spend $150+ for a name brand one, I figured this would work fine. Turned out to be the case. Side by side they almost look the same and the CEL turned off as soon as the sensor was replaced.Great value and functionality.
mahmoud
Reviewed in the United States on November 29, 2023
i was excited to find a cheaper alternative but the car start acting up 3 days after installing O2 sensors and lost power and after new diag turns to be the O2 sensors failed . replaced them with OEM (expensive ) but problem solved , now too late to return them .
S. L. Davis
Reviewed in the United States on December 22, 2022
The product was perfectly made just like the original one. I know because I’m a ASE Parts Specialist. When you’re changing an O2 sensor they are not all made the same and it make you believe that it may not be the right part even though it may work out. This product is identical, worked, and cleared my engine light. I needed 2 installed them and after waiting a a year to ensure they didn’t come right back on like some cheap parts will do, I’m still happy with your product! ThankYou!
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