{"product_id":"denso-o2-oxygen-sensor-234-4621-direct-fit-for-select-acura-honda-4-wire-heated-zirconia","title":"Denso O2 Oxygen Sensor 234-4621 — Direct-Fit for Select Acura \u0026 Honda, 4-Wire Heated Zirconia","description":"\u003cstrong\u003eDenso 234-4621 is a direct-fit narrow-band oxygen (O2) sensor built to OE standards for select Acura and Honda models, providing accurate air–fuel monitoring and long-lasting operation.\u003c\/strong\u003e\n\n\u003cp\u003eThis replacement O2 sensor from Denso is engineered to match original equipment fit and function for a range of Acura and Honda vehicles. It uses a refined zirconia sensing element and Denso's protective aluminum oxide trap layer to resist common contaminants, while a 4-wire 20.28-inch harness simplifies installation and electrical integration. The result is a component designed to deliver dependable readings, corrosion resistance, and a long service life when compared to cheaper aftermarket alternatives.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this sensor affect my vehicle’s performance?\u003c\/h3\u003e\n\u003cp\u003eAccurate oxygen readings are essential for the engine control unit to maintain the correct air–fuel ratio. Installing a properly functioning sensor helps the ECU make precise fuel trims, which supports smoother idling, consistent throttle response, and more stable emissions control.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRefined zirconia element gives faster, reliable voltage response to exhaust oxygen content.\u003c\/li\u003e\n  \u003cli\u003ePTFE filter reduces contaminant buildup that dulls sensor accuracy.\u003c\/li\u003e\n  \u003cli\u003e4-wire harness provides heater feedback for quicker warm-up and stable readings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this Denso part fit my Acura or Honda model?\u003c\/h3\u003e\n\u003cp\u003eDenso part 234-4621 is designed for a specific list of Acura and Honda years and models. Confirm compatibility by cross-referencing the part number and vehicle year — the sensor is intended as a direct replacement for the listed applications and common OEM interchange numbers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAcura: 2001–2003 CL, 2001–2003 EL, 2000–2005 NSX, 1999–2003 TL.\u003c\/li\u003e\n  \u003cli\u003eHonda: 1990–1993 \u0026amp; 1998–2002 Accord, 2001–2003 Civic, 1997–2001 Prelude.\u003c\/li\u003e\n  \u003cli\u003eAlso matches multiple OEM interchange numbers for straightforward replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow is this Denso sensor protected against contamination and corrosion?\u003c\/h3\u003e\n\u003cp\u003eDenso adds material and design features to limit performance loss from exposure to exhaust contaminants and road conditions. Corrosion-resistant stainless steel and a PTFE filter reduce external and internal fouling, while an aluminum oxide trap protects the ceramic sensing element from silicon and lead contamination.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStainless steel housing resists corrosion from moisture and road salts.\u003c\/li\u003e\n  \u003cli\u003ePTFE filter blocks particulates that can impair sensor response.\u003c\/li\u003e\n  \u003cli\u003eAluminum oxide trap extends element life against contaminant poisoning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow straightforward is installation and what are the physical specs?\u003c\/h3\u003e\n\u003cp\u003eThe sensor ships with a 4-wire 20.28-inch wiring harness to match original electrical connections and heater control. Dimensionally compact and lightweight, it’s intended for a first-time fit in compatible exhaust locations; basic mechanical skills and common tools are typically all that’s required to install it.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes 20.28-inch 4-wire harness for plug-and-play electrical connection.\u003c\/li\u003e\n  \u003cli\u003eItem dimensions approximately 5.75 x 2.19 x 1.88 inches; weight about 0.25 lb.\u003c\/li\u003e\n  \u003cli\u003ePackage quantity: 1 sensor — replace one upstream or downstream unit as needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This Denso 234-4621 O2 sensor is aimed at owners, mechanics, and restoration enthusiasts working on the listed Acura and Honda models who want an OE-quality replacement. It’s suitable for anyone seeking a robust, contamination-resistant narrow-band sensor with direct-fit wiring, including those servicing emissions systems, tuning fuel trims, or restoring vehicle drivability after a failing oxygen sensor.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this sensor fit my 2002 Acura TL?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — Denso 234-4621 is listed for 1999–2003 Acura TL models; verify your vehicle’s OEM part number to confirm fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the harness long enough for direct replacement?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it includes a 4-wire harness 20.28 inches long intended to match original connections for direct fit.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Denso","offers":[{"title":"Default Title","offer_id":48082907070622,"sku":"B000C5YCUM","price":55.67,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/denso-234-4621-front-view.jpg?v=1785819151","url":"https:\/\/northtrailauto.ca\/products\/denso-o2-oxygen-sensor-234-4621-direct-fit-for-select-acura-honda-4-wire-heated-zirconia","provider":"North Trail Auto","version":"1.0","type":"link"}