{"product_id":"tautoy-oxygen-sensor-kit-for-subaru-h4-2-0l-2-5l-upstream-downstream-pair-stainless-steel","title":"TAUTOY Oxygen Sensor Kit for Subaru H4 2.0L\/2.5L — Upstream \u0026 Downstream Pair, Stainless Steel","description":"\u003cp\u003e\u003cstrong\u003eTAUTOY 2PCS O2 Oxygen Sensor kit includes one upstream and one downstream sensor engineered to restore accurate oxygen measurement for compatible Subaru engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese two direct-fit oxygen sensors (upstream and downstream) are designed as replacement parts for a range of Subaru models with H4 2.0L and 2.5L engines. Each sensor is manufactured with a double laser-welded stainless steel body and matched sensing elements to provide consistent feedback to the engine control unit (ECU). The kit lists multiple OEM part numbers to help you verify compatibility before purchase and comes with a one-year warranty for peace of mind.\u003c\/p\u003e\n\n\u003ch3\u003eWhich Subaru models and engine types does this TAUTOY sensor kit fit?\u003c\/h3\u003e\n\n\u003cp\u003eThis sensor pair is compatible with many naturally aspirated and DOHC Subaru applications across model years listed in the fitment. It fits both upstream (pre-catalytic converter) and downstream (post-catalytic converter) positions where the OEM part numbers match. Always cross-check the OEM numbers against your vehicle’s current sensors or service manual before ordering.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCompatible models: Crosstrek (2016–2020 H4 2.0L), Forester (2013–2020 H4 2.5L), Impreza (2012–2020 H4 2.0L), Legacy\/Outback (2013–2019 H4 2.5L), and XV Crosstrek variants (2013–2015).\u003c\/li\u003e\n  \u003cli\u003eOEM numbers referenced: 350-34052, 350-64031, 250-24487, 250-54084, OS5579 and equivalents.\u003c\/li\u003e\n  \u003cli\u003eDesigned for gas engines listed in product fitment; verify engine code and sensor location first.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the TAUTOY O2 sensor pair affect engine performance and diagnostics?\u003c\/h3\u003e\n\n\u003cp\u003eProper oxygen sensor readings help the ECU adjust fuel delivery and ignition timing more precisely, which supports smoother running and more reliable emissions feedback. Replacing failing sensors can clear fault codes related to air–fuel ratio and catalytic converter efficiency. These TAUTOY sensors aim to provide stable, repeatable voltage or wideband signals depending on your vehicle’s system type.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eImproves ECU accuracy for air–fuel ratio adjustments.\u003c\/li\u003e\n  \u003cli\u003eHelps reduce false oxygen-related diagnostic trouble codes (DTCs).\u003c\/li\u003e\n  \u003cli\u003eRestores consistent sensor response with stainless steel housing and precision sensing element.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the build quality and technical details of these replacement sensors?\u003c\/h3\u003e\n\n\u003cp\u003eThe sensors feature a double laser-welded stainless steel enclosure for corrosion resistance and mechanical durability in the exhaust environment. The internal sensing element is manufactured to measure oxygen partial pressure and provide repeatable data to the vehicle’s control systems. The kit contains one upstream and one downstream sensor to replace a pair often changed together for consistent performance across the exhaust system.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eConstruction: stainless steel body with double laser welding for durability.\u003c\/li\u003e\n  \u003cli\u003eFunction: high-precision oxygen partial pressure measurement for accurate signals to the ECU.\u003c\/li\u003e\n  \u003cli\u003eContents: two sensors—one upstream (pre-cat) and one downstream (post-cat).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is installation and what should I check before replacing sensors?\u003c\/h3\u003e\n\n\u003cp\u003eInstallation is typically straightforward for anyone comfortable working under the vehicle and handling basic hand tools; however, anti-seize on threads is usually recommended and some models may require raising the vehicle for access. Before installing, confirm the OEM part numbers, connector type, and the sensor’s position (upstream vs downstream). If you’re unsure, consult a repair manual or a professional mechanic to avoid misidentification.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eTools: common hand tools and a sensor socket may be required.\u003c\/li\u003e\n  \u003cli\u003ePreparation: verify OEM part numbers and connector compatibility first.\u003c\/li\u003e\n  \u003cli\u003eTip: replace both sensors as a pair to maintain consistent sensor response across the exhaust.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The TAUTOY 2PCS O2 Oxygen Sensor kit is intended for DIYers, independent mechanics, and fleet service shops working on compatible Subaru models that need direct-fit upstream and downstream oxygen sensor replacements. It’s suited for owners who want an OEM-referenced replacement with durable stainless steel construction and a one-year warranty, and for anyone troubleshooting oxygen-sensor-related fault codes or poor engine running tied to sensor failure.\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: Are these sensors direct replacements for Subaru OEM parts?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the kit references OEM part numbers (350-34052, 350-64031, 250-24487, 250-54084) and is designed as direct-fit replacements for matching Subaru models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do both sensors come with a warranty?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the TAUTOY 2-piece oxygen sensor kit includes a one-year warranty covering manufacturing defects.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"TAUTOY","offers":[{"title":"Default Title","offer_id":67587318775993,"sku":"B0F8Q2K5Q8","price":102.59,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/tautoy-front-packaging-sensors.jpg?v=1790505812","url":"https:\/\/redleafauto.ca\/products\/tautoy-oxygen-sensor-kit-for-subaru-h4-2-0l-2-5l-upstream-downstream-pair-stainless-steel","provider":"Redleaf Auto","version":"1.0","type":"link"}