{"product_id":"o2-oxygen-sensor-upstream-downstream-for-mazda-6-2011-2013-3-7l","title":"O2 Oxygen Sensor Upstream Downstream for Mazda 6 (2011-2013) 3.7L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Oxygen Sensor Replacement Kit for 2011-2013 Mazda 6 (GH)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece oxygen sensor kit monitors pre- and post-catalytic exhaust gases on the 2011-2013 Mazda 6 3.7L to restore closed-loop fuel trims, optimize the air-fuel ratio, and eliminate diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mazda 6 Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eOver extended operating cycles, factory oxygen sensors on the \u003cstrong\u003e3.7L MZI V6\u003c\/strong\u003e succumb to exhaust particulate buildup, silica contamination, and thermal fatigue. As internal zirconia elements deteriorate, response times lag significantly, forcing the engine control module into prolonged rich or lean conditions. In the \u003cstrong\u003eGH\u003c\/strong\u003e chassis, this sluggish sensor activity commonly triggers persistent P0130–P0161 circuit codes or false catalyst efficiency alerts (P0420\/P0430), leading to unburned hydrocarbons, increased fuel consumption, rough idle transitions, and fouled spark plugs.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive 4-sensor package replaces both upstream air-fuel ratio sensors and downstream heated oxygen sensors simultaneously, preventing mixed-signal imbalances across cylinder banks. Constructed with laser-welded 304 stainless steel housings, double-layered protective shields, and robust internal ceramic elements, these units withstand intense exhaust heat soak without signal drift. Factory-pinned, pre-terminated wiring harnesses and weatherproof connector bodies match OE specifications precisely, enabling direct plug-and-play installation without cutting, splicing, or pinning.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2x Upstream Oxygen Sensors\u003c\/li\u003e\n  \u003cli\u003e2x Downstream Oxygen Sensors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \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;\"\u003e2011-2013 Mazda 6\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;\"\u003e\n\u003cstrong\u003e3.7L MZI V6\u003c\/strong\u003e \/ \u003cstrong\u003eGH\u003c\/strong\u003e\n\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;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e272 hp \/ 269 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\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;\"\u003e\n\u003cstrong\u003e234-4489\u003c\/strong\u003e, \u003cstrong\u003e234-5038\u003c\/strong\u003e, \u003cstrong\u003eBR3Z-9G444-A\u003c\/strong\u003e, \u003cstrong\u003eBR3Z9G444A\u003c\/strong\u003e, \u003cstrong\u003eBE5Z9G444D\u003c\/strong\u003e, \u003cstrong\u003eBH6Z9G444A\u003c\/strong\u003e, \u003cstrong\u003eBL3Z9F472A\u003c\/strong\u003e, \u003cstrong\u003eBL3Z9G472A\u003c\/strong\u003e, \u003cstrong\u003eCA38188G1\u003c\/strong\u003e, \u003cstrong\u003eCA3918861\u003c\/strong\u003e, \u003cstrong\u003eCA4118861\u003c\/strong\u003e, \u003cstrong\u003eCK4Z9G444D\u003c\/strong\u003e, \u003cstrong\u003eDY1178\u003c\/strong\u003e, \u003cstrong\u003eOS5578\u003c\/strong\u003e, \u003cstrong\u003eZZDL18861\u003c\/strong\u003e, \u003cstrong\u003e234-4490\u003c\/strong\u003e, \u003cstrong\u003e9E5Z9F472D\u003c\/strong\u003e, \u003cstrong\u003e2344489\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2011 Mazda 6 s (3.7L V6 DOHC)\u003c\/li\u003e\n  \u003cli\u003e2012 Mazda 6 s (3.7L V6 DOHC)\u003c\/li\u003e\n  \u003cli\u003e2013 Mazda 6 s (3.7L V6 DOHC)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GH 6?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2011-2013 Mazda 6 equipped with the \u003cstrong\u003e3.7L MZI V6\u003c\/strong\u003e engine. \u003cstrong\u003eThis kit does not fit 2.5L 4-cylinder models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eAre the harnesses pre-wired with factory connectors?\u003c\/h4\u003e\n\u003cp\u003eYes, each sensor features factory-correct plugs and exact harness lengths, eliminating the need for wire cutting or splicing.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mazda Performance Standard\u003c\/h3\u003e\n\u003cp\u003eRestoring factory stoichiometric precision maintains the responsive power delivery and linear acceleration expected from your V6 sports sedan while protecting downstream catalytic converters from fuel washing.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551457935608,"sku":"DS-ETABXJXF3","price":99.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-mazda-6-2011-2013-3-7l-1.jpg?v=1790796640","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-mazda-6-2011-2013-3-7l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}