{"product_id":"o2-oxygen-sensor-upstream-downstream-for-subaru-crosstrek-impreza-2016-2020-2-0l","title":"O2 Oxygen Sensor Upstream Downstream for Subaru Crosstrek Impreza (2016-2020) 2.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream \u0026amp; Downstream O2 Sensor Kit for 2016-2020 Subaru Crosstrek \u0026amp; Impreza (GP\/GT\/GJ\/GK)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This matched upstream and downstream oxygen sensor kit monitors exhaust oxygen levels on the \u003cstrong\u003eFB20 2.0L H4\u003c\/strong\u003e in \u003cstrong\u003eGP\/GT\/GJ\/GK\u003c\/strong\u003e Subaru Crosstrek and Impreza models to regulate air-fuel ratio and catalyst efficiency.\u003c\/p\u003e\u003ch3\u003eThe Stock Subaru Crosstrek \u0026amp; Impreza O2 Sensor Failure\u003c\/h3\u003e\u003cp\u003eOn \u003cstrong\u003eGP\/GT\/GJ\/GK\u003c\/strong\u003e vehicles equipped with the \u003cstrong\u003eFB20 2.0L H4\u003c\/strong\u003e, factory upstream and downstream oxygen sensors suffer from thermal cycling fatigue, silicone or oil-vapor contamination, and internal heater circuit burnout. Once the zirconia element slows or the heater opens, the ECM loses accurate closed-loop lambda feedback. This degradation forces incorrect fuel trims and triggers \u003cstrong\u003eP0137\u003c\/strong\u003e, \u003cstrong\u003eP0171\u003c\/strong\u003e, \u003cstrong\u003eP0030\u003c\/strong\u003e, or \u003cstrong\u003eP0420\u003c\/strong\u003e fault codes.\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:\u003c\/strong\u003e Triggers \u003cstrong\u003eP0137\u003c\/strong\u003e, \u003cstrong\u003eP0030\u003c\/strong\u003e, \u003cstrong\u003eP0171\u003c\/strong\u003e, or \u003cstrong\u003eP0420\u003c\/strong\u003e from sluggish switching or heater faults.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eErratic Fuel Trims:\u003c\/strong\u003e Skewed lambda readings cause rough idle and hesitation under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoor Economy \u0026amp; Emissions:\u003c\/strong\u003e Rich running reduces MPG and blocks emissions readiness.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Zirconia O2 Sensor Solution\u003c\/h3\u003e\u003cp\u003eEngineered as direct-fit replacements for OEM numbers \u003cstrong\u003e234-9138\u003c\/strong\u003e and \u003cstrong\u003e22641-AA670\u003c\/strong\u003e, this matched kit pairs a fast-acting upstream air-fuel sensor with a precision downstream zirconia narrowband sensor. Laser-welded stainless steel housings, PTFE breathability filters, and dual-layer protective shields resist moisture shock and carbon fouling. Factory-length harnesses and keyed OEM connectors bolt directly into stock exhaust bungs without splicing.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 Upstream Oxygen Sensor\u003c\/li\u003e\n\u003cli\u003e1 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;\"\u003e2016-2020 Subaru Crosstrek, 2016-2017 Subaru Impreza\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;\"\u003eFB20 2.0L H4 \/ GP, GT, GJ, GK\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; Sensing Element\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eUpstream Air-Fuel \u0026amp; Downstream Zirconia Ceramic\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\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e234-9138, 22641-AA670\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCrosstrek 2016-2020 2.0L Naturally Aspirated (Hybrid and Plug-In Hybrid not included)\u003c\/li\u003e\n\u003cli\u003eImpreza 2016-2017 2.0L\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the GP\/GT\/GJ\/GK Crosstrek \u0026amp; Impreza?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Fits 2016-2020 Crosstrek and 2016-2017 Impreza with the naturally aspirated \u003cstrong\u003eFB20 2.0L H4\u003c\/strong\u003e. \u003cstrong\u003eExcludes hybrid and plug-in hybrid trims; confirm engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0137, P0171, or P0420 codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, if worn sensors caused the fault.\u003c\/strong\u003e Replacing \u003cstrong\u003e234-9138\u003c\/strong\u003e and \u003cstrong\u003e22641-AA670\u003c\/strong\u003e restores lambda accuracy; inspect for exhaust leaks if \u003cstrong\u003eP0420\u003c\/strong\u003e persists.\u003c\/p\u003e\u003ch4\u003eAre OEM connectors included for direct installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Both sensors feature factory-keyed plugs and OEM thread pitch; tighten to spec without contaminating sensor tips.\u003c\/p\u003e\u003ch3\u003eThe Subaru Precision Standard\u003c\/h3\u003e\u003cp\u003eBuilt for accurate closed-loop fueling on the \u003cstrong\u003eFB20 2.0L H4\u003c\/strong\u003e, this sensor kit restores crisp throttle response and CEL-free emissions compliance. High-temperature durability ensures steady voltage output across daily driving.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68115660177656,"sku":"DS-EBVI8J9S2","price":80.95,"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-crosstrek-impreza-2016-2020-2-0l-1.jpg?v=1794706903","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-subaru-crosstrek-impreza-2016-2020-2-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}