--- product_id: 455330171 title: "Marsflex Air Fuel Ratio O2 Oxygen Sensor Upstream 234-9040 Compatible with Honda 2003-2007 Accord EX/EX-L/LX/DX/SE L4 2.4L, Replacement 36531-RAA-A02 36531RAAA02 1Pcs" brand: "marsflex" price: "β‚©104852" currency: KRW in_stock: true reviews_count: 9 category: "Marsflex" url: https://www.desertcart.kr/products/455330171-marsflex-air-fuel-ratio-o2-oxygen-sensor-upstream-234-9040 store_origin: KR region: South Korea --- # 18s fast response time OE-spec plug & fit 930Β°C max temp tolerance Marsflex Air Fuel Ratio O2 Oxygen Sensor Upstream 234-9040 Compatible with Honda 2003-2007 Accord EX/EX-L/LX/DX/SE L4 2.4L, Replacement 36531-RAA-A02 36531RAAA02 1Pcs **Brand:** marsflex **Price:** β‚©104852 **Availability:** βœ… In Stock ## Summary > πŸš— Upgrade your ride’s brain with Marsflex precision – because your Accord deserves the best! ## Quick Answers - **What is this?** Marsflex Air Fuel Ratio O2 Oxygen Sensor Upstream 234-9040 Compatible with Honda 2003-2007 Accord EX/EX-L/LX/DX/SE L4 2.4L, Replacement 36531-RAA-A02 36531RAAA02 1Pcs by marsflex - **How much does it cost?** β‚©104852 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/455330171-marsflex-air-fuel-ratio-o2-oxygen-sensor-upstream-234-9040) ## 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 - β€’ **Durability That Lasts:** Built to withstand extreme temps up to 930Β°C for long-lasting reliability - β€’ **Precision Engine Tuning:** Optimized air-fuel ratio for peak performance and fuel economy - β€’ **Hassle-Free Installation:** 17.9-inch length with flange mount design ensures quick, tool-friendly replacement - β€’ **Seamless OEM Compatibility:** Exact fit for 2003-2007 Honda Accord 2.4L models, plug & play installation - β€’ **Fuel Savings & Emissions Control:** Improves catalytic converter life while reducing emissions and check engine alerts ## Overview The Marsflex Air Fuel Ratio O2 Oxygen Sensor (234-9040) is a high-quality upstream sensor designed specifically for 2003-2007 Honda Accord 2.4L models. Engineered to meet or exceed OEM specs, it offers fast 18-second response time, withstands extreme temperatures up to 930Β°C, and ensures precise air-fuel mixture monitoring. This sensor enhances engine performance, fuel efficiency, and catalytic converter longevity, while its plug-and-play design guarantees easy installation. Backed by a 1-year warranty and extensive quality testing, it’s the smart upgrade for maintaining your Accord’s optimal drive. ## Description Product description What is the life expectancy of an oxygen sensor? 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 What is the life expectancy of an oxygen sensor? 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 Do I need to replace all of the sensors at once? 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 Do I need to replace all of the sensors at once? 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 The oxygen sensor will not come out. 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 The oxygen sensor will not come out. 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 Why does the fault code still exist after replacing the oxygen sensor? 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 Why does the fault code still exist after replacing the oxygen sensor? 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 Will this oxygen sensor work with my vehicle? Marsflex oxygen sensor is consistent with OEM, please refer to the page information for compatibility information. You can check 'desertcart confirmed it' for confirmation, or provide us with your vehicle information and we will confirm it for you. Will this oxygen sensor work with my vehicle? Marsflex oxygen sensor is consistent with OEM, please refer to the page information for compatibility information. You can check 'desertcart confirmed it' for confirmation, or provide us with your vehicle information and we will confirm it for you. Review: No more check engine - Car started getting bad gas mileage and check engine light on. Took out the old O2 sensor and tip.was burnt so bought this new O2 sensor, so far gas mileage improved and no more check engine light. WILL UPDATE IN 4 WEEKS! Review: O2 Sensors - Perfect fit! ## 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 Air Fuel Ratio O2 Oxygen Sensor 234-9040 fit for 2003-2007 Accord EX L4 2.4L , 2007 Accord EX-L L4 2.4L, 2003-2007 Accord LX L4 2.4L, 2007 Accord Special Edition L4 2.4L, 2006-2007 Accord Value Package L4 2.4L, 2006 Accord LX Special Edition L4 2.4L, 2003-2005 Accord DX L4 2.4L, 2005 Accord SE L4 2.4L - 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 17.9 nch. 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 | |---------------|-------| | ASIN | B0B1ZR6KNZ | | Best Sellers Rank | #904,144 in Automotive ( See Top 100 in Automotive ) #5,041 in Automotive Replacement Oxygen Sensors | | Brand | Marsflex | | Brand Name | Marsflex | | Current Rating | 6 Amps | | Customer Reviews | 4.3 out of 5 stars 149 Reviews | | Included Components | 1. 234-9040 Oxygen Sensor 2. Oxygen Sensor Instruction Manual | | Item Dimensions | 5.91 x 2.17 x 2.17 inches | | Item dimensions L x W x H | 5.91 x 2.17 x 2.17 inches | | Lower Temperature Rating | 150 Degrees Celsius | | Manufacturer | Marsmotor | | Material | 234-9040 | | Material Type | 234-9040 | | Maximum Supply Voltage | 20 Volts | | Measurement Accuracy | Go & No-go Gauge | | Measuring Range | Ξ»=0.6- ∞ | | Model | 234-9040 | | Mounting Type | Flange Mount | | Output Type | Analog | | Part Number | APEL14057 | | Response Time | 18 seconds | | Sensing Distance | 1000 Millimeters | | Specific Uses For Product | Oxygen Sensor | | Style | Upstream | | Style Name | Upstream | | Upper Temperature Rating | 930 Degrees Celsius | ## Product Details - **Brand:** Marsflex - **Item dimensions L x W x H:** 5.91 x 2.17 x 2.17 inches - **Material:** 234-9040 - **Style:** Upstream - **Current Rating:** 6 Amps ## Images ![Marsflex Air Fuel Ratio O2 Oxygen Sensor Upstream 234-9040 Compatible with Honda 2003-2007 Accord EX/EX-L/LX/DX/SE L4 2.4L, Replacement 36531-RAA-A02 36531RAAA02 1Pcs - Image 1](https://m.media-amazon.com/images/I/61mfRWuSGVL.jpg) ![Marsflex Air Fuel Ratio O2 Oxygen Sensor Upstream 234-9040 Compatible with Honda 2003-2007 Accord EX/EX-L/LX/DX/SE L4 2.4L, Replacement 36531-RAA-A02 36531RAAA02 1Pcs - Image 2](https://m.media-amazon.com/images/I/61KjOU7ChhL.jpg) ![Marsflex Air Fuel Ratio O2 Oxygen Sensor Upstream 234-9040 Compatible with Honda 2003-2007 Accord EX/EX-L/LX/DX/SE L4 2.4L, Replacement 36531-RAA-A02 36531RAAA02 1Pcs - Image 3](https://m.media-amazon.com/images/I/61qmw0c8mPL.jpg) ![Marsflex Air Fuel Ratio O2 Oxygen Sensor Upstream 234-9040 Compatible with Honda 2003-2007 Accord EX/EX-L/LX/DX/SE L4 2.4L, Replacement 36531-RAA-A02 36531RAAA02 1Pcs - Image 4](https://m.media-amazon.com/images/I/614YZDcLRgL.jpg) ![Marsflex Air Fuel Ratio O2 Oxygen Sensor Upstream 234-9040 Compatible with Honda 2003-2007 Accord EX/EX-L/LX/DX/SE L4 2.4L, Replacement 36531-RAA-A02 36531RAAA02 1Pcs - Image 5](https://m.media-amazon.com/images/I/71KfsYGKeeL.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 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 **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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ No more check engine *by R***D on August 9, 2023* Car started getting bad gas mileage and check engine light on. Took out the old O2 sensor and tip.was burnt so bought this new O2 sensor, so far gas mileage improved and no more check engine light. WILL UPDATE IN 4 WEEKS! ### ⭐⭐⭐⭐⭐ O2 Sensors *by C***T on May 3, 2026* Perfect fit! ### ⭐⭐⭐⭐⭐ O2 sensor *by G***S on May 31, 2025* Perfect first, engine light has not returned ## Frequently Bought Together - Marsflex Air Fuel Ratio O2 Oxygen Sensor Upstream 234-9040 Compatible with Honda 2003-2007 Accord EX/EX-L/LX/DX/SE L4 2.4L, Replacement 36531-RAA-A02 36531RAAA02 1Pcs - Oxygen O2 Sensor Downstream 234-4797 for Honda Accord 2.4L 2003 2004 2005 2006 2007 - FOMIUZY High Flow Front Catalytic Converter Kit Direct-Fit Honda Accord 2003 2004 2005 2006 2007 2.4L --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.kr/products/455330171-marsflex-air-fuel-ratio-o2-oxygen-sensor-upstream-234-9040](https://www.desertcart.kr/products/455330171-marsflex-air-fuel-ratio-o2-oxygen-sensor-upstream-234-9040) --- *Product available on Desertcart South Korea* *Store origin: KR* *Last updated: 2026-07-23*