{"product_id":"o2-oxygen-sensor-upstream-downstream-for-subaru-legacy-outback-2000-2002-2-5l","title":"O2 Oxygen Sensor Upstream Downstream for Subaru Legacy Outback (2000-2002) 2.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream \u0026amp; Downstream O2 Oxygen Sensor Kit for 2000-2002 Subaru Legacy \u0026amp; Outback (BE\/BH)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This matched upstream and downstream oxygen sensor kit restores closed-loop air-fuel ratio monitoring and catalytic converter efficiency tracking on 2000-2002 Subaru Legacy and Outback (\u003cstrong\u003eBE\/BH\u003c\/strong\u003e) models equipped with the \u003cstrong\u003eEJ251 2.5L\u003c\/strong\u003e engine.\u003c\/p\u003e\u003ch3\u003eThe Stock Subaru Legacy \u0026amp; Outback Oxygen Sensor Failure\u003c\/h3\u003e\u003cp\u003eOver high mileage, factory zirconia sensing elements on the \u003cstrong\u003eBE\/BH\u003c\/strong\u003e chassis suffer thermal shock, carbon fouling, and internal heater circuit fatigue inside the \u003cstrong\u003eEJ251 2.5L\u003c\/strong\u003e exhaust stream. Soot buildup coats the ceramic thimble, slowing voltage cross-counts and skewing ECM fuel trims. Simultaneously, exhaust condensation corrodes internal platinum electrodes and heater leads, triggering \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0133\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, and \u003cstrong\u003eP0141\u003c\/strong\u003e fault codes while causing inaccurate \u003cstrong\u003eP0420\u003c\/strong\u003e catalyst readings.\u003c\/p\u003e\u003ch4\u003eCommon Symptoms of a Failing OEM Oxygen Sensor\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck Engine Light \u0026amp; DTCs:\u003c\/strong\u003e Logs \u003cstrong\u003eP0130\u003c\/strong\u003e (circuit fault), \u003cstrong\u003eP0133\u003c\/strong\u003e (slow response), \u003cstrong\u003eP0135\/P0141\u003c\/strong\u003e (heater failure), or \u003cstrong\u003eP0420\u003c\/strong\u003e codes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRich Running \u0026amp; Poor MPG:\u003c\/strong\u003e Sluggish upstream switching forces open-loop fueling, fouling spark plugs and dropping fuel economy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrivability \u0026amp; Emissions Failure:\u003c\/strong\u003e Skewed O2 feedback causes throttle hesitation and fails OBD-II readiness monitors.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Oxygen Sensor Solution\u003c\/h3\u003e\u003cp\u003eReplacing both the upstream air-fuel sensor and downstream catalyst monitor as a matched pair restores synchronized voltage signaling across the \u003cstrong\u003eEJ251 2.5L\u003c\/strong\u003e exhaust. Each unit uses a laser-welded stainless housing and heated ceramic zirconia element built to withstand moisture intrusion and thermal cycling on \u003cstrong\u003eBE\/BH\u003c\/strong\u003e platforms. Factory-style weatherpack connectors, exact-fit wire harnesses, and anti-seize coated M18x1.5 threads ensure zero splicing and instant plug-and-play ECU recognition.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1x Direct-Fit Upstream Oxygen Sensor\u003c\/li\u003e\n\u003cli\u003e1x Direct-Fit Downstream Oxygen Sensor\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2000-2002 Subaru Legacy, Outback\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eEJ251 2.5L H4 \/ BE (Sedan), BH (Wagon\/Outback)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEmissions \u0026amp; Sensor Spec\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eHeated Zirconia Element \/ Matched Upstream \u0026amp; Downstream Pair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eInstallation Type\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDirect Bolt-On OEM Replacement (No Cutting or Welding)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2000-2002 Subaru Legacy 2.5L (1 Upstream, 1 Downstream)\u003c\/li\u003e\n\u003cli\u003e2000-2002 Subaru Outback 2.5L (1 Upstream, 1 Downstream)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the BE\/BH Legacy \u0026amp; Outback?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This kit is a direct fit for 2000-2002 Subaru Legacy and Outback models with the \u003cstrong\u003eEJ251 2.5L\u003c\/strong\u003e 4-cylinder engine. \u003cstrong\u003eExcludes 3.0L H6 (EZ30D) Outback trims; confirm your 2.5L engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0135, P0141, or P0420 codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, for sensor-related faults.\u003c\/strong\u003e Replacing failed sensors resolves \u003cstrong\u003eP0135\u003c\/strong\u003e and \u003cstrong\u003eP0141\u003c\/strong\u003e heater faults and \u003cstrong\u003eP0133\u003c\/strong\u003e slow-response codes; a persistent \u003cstrong\u003eP0420\u003c\/strong\u003e after installation indicates an exhausted catalytic converter.\u003c\/p\u003e\u003ch4\u003eIs wire splicing or extra hardware required for installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eNo splicing is required.\u003c\/strong\u003e Both sensors feature factory-style connectors that plug straight into OEM harnesses; simply torque threads to 25-30 lb-ft and clear stored ECU codes.\u003c\/p\u003e\u003ch3\u003eThe Subaru Precision Standard\u003c\/h3\u003e\u003cp\u003eEngineered for flat-four boxer durability, this matched O2 sensor pair restores crisp throttle response, balanced fuel trims, and reliable closed-loop emission control across your \u003cstrong\u003eBE\/BH\u003c\/strong\u003e Legacy or Outback.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68119393468664,"sku":"DS-EOZMU6R6P","price":56.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-subaru-legacy-outback-2000-2002-2-5l-1.jpg?v=1794719817","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-subaru-legacy-outback-2000-2002-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}