{"product_id":"replacement-oxygen-sensor-for-toyota-tundra-tacoma-4runner-direct","title":"Replacement Oxygen Sensor for Toyota Tundra Tacoma 4Runner - Direct","description":"\u003cp\u003eIn this review the focus is on a direct-replacement \u003cstrong\u003eupstream oxygen sensor\u003c\/strong\u003e meant for early 2000s Toyota trucks and SUVs. The bottom line: this AA Ignition sensor is for DIY owners and independent shops who need a heated, four-wire upstream O2 sensor that matches factory fit and wiring to restore proper air\/fuel feedback and clear the check engine light. It is most valuable when you confirm the plug and length match the old sensor before buying.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement Upstream Sensor:\u003c\/strong\u003e Measures oxygen in exhaust and restores accurate air\/fuel feedback so the engine and catalytic converter operate correctly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVehicle Compatibility:\u003c\/strong\u003e Fits specified Toyota Tundra, Tacoma and 4Runner model years so buyers can find a direct swap for these early 2000s applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-Wire Heated Design:\u003c\/strong\u003e The heated, four-wire construction delivers fast sensor warm-up and consistent readings for reliable closed-loop operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Fit and Finish:\u003c\/strong\u003e Made to match original part form and function so installation is straightforward and the sensor works like the factory unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces Multiple Part Numbers:\u003c\/strong\u003e Cross-references common OEM numbers so you can replace part# 234-9001 and related Toyota numbers with confidence.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLifetime Warranty:\u003c\/strong\u003e Includes a lifetime guarantee from the manufacturer, offering long-term protection against premature failure.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis sensor is best for owners of 2000-2004 Toyota Tundra 3.4L, 2001-2004 Toyota Tacoma 2.4L and 2.7L, and 2000 Toyota 4Runner 2.7L who want a cost-effective, direct-fit upstream oxygen sensor. It suits mechanically comfortable DIYers and independent repair shops that need a heated four-wire replacement that matches the original connector and wiring.\u003c\/p\u003e\u003cp\u003eIt is not for buyers who are unsure about connector type or sensor length; measuring the old sensor and checking pins is essential. Customers with different engine sizes, later model years, or downstream\/secondary sensor needs should look for the exact sensor specified for those positions.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDirect replacement design that restores proper O2 feedback and can clear CEL related to upstream sensor faults.\u003c\/li\u003e\n\u003cli\u003eHeated four-wire construction ensures quicker warm-up and stable readings in varied conditions.\u003c\/li\u003e\n\u003cli\u003eCovers multiple OEM part numbers, reducing the risk of buying the wrong replacement when matched correctly.\u003c\/li\u003e\n\u003cli\u003eLifetime warranty provides added confidence for long-term use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatibility depends on plug style and sensor length, so buyers must verify the old sensor before ordering.\u003c\/li\u003e\n\u003cli\u003eFit is specific to listed Toyota years and engines; it will not suit other positions or different model years.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003ePosition\u003c\/td\u003e\n\u003ctd\u003eFront upstream oxygen sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector \/ Wires\u003c\/td\u003e\n\u003ctd\u003eHeated, 4 wire leads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Vehicles\u003c\/td\u003e\n\u003ctd\u003eTundra 2000-2004 3.4L; Tacoma 2001-2004 2.4L\/2.7L; 4Runner 2000 2.7L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplaces Part Numbers\u003c\/td\u003e\n\u003ctd\u003e234-9001, 8946734021, 8946735030, 8946735050, 8946735060\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eMeasures oxygen in exhaust to support proper fuel trim and catalytic converter operation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLifetime warranty from manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe AA Ignition upstream oxygen sensor is a practical, value-minded replacement for owners of the specified early 2000s Toyota Tundra, Tacoma and 4Runner models who need a heated, four-wire direct swap. It restores proper O2 readings and can resolve related check engine light issues, provided buyers verify plug and length compatibility before purchase.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill this sensor fit my 2002 Tacoma?\u003c\/strong\u003e\u003cbr\u003eIf your 2002 Tacoma is the 2.4L or 2.7L and the original sensor is a front upstream heated four-wire with the same plug style and length, this sensor is a direct replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the sensor include a warranty?\u003c\/strong\u003e\u003cbr\u003eYes, the sensor comes with a lifetime warranty from the manufacturer; contact them for replacement if it fails.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this replace a downstream sensor?\u003c\/strong\u003e\u003cbr\u003eNo, this listing is for the front upstream oxygen sensor; downstream or secondary positions may require a different part or connector.\u003c\/p\u003e","brand":"AA Ignition","offers":[{"title":"Default Title","offer_id":48148818460891,"sku":"B0968LZ9PQ","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61w2yPIpYGL.__AC_SX300_SY300_QL70_FMwebp.webp?v=1768799694","url":"https:\/\/gearmusthave.com\/products\/replacement-oxygen-sensor-for-toyota-tundra-tacoma-4runner-direct","provider":"GearMustHave","version":"1.0","type":"link"}