{"product_id":"o2-oxygen-sensor-upstream-downstream-for-volvo-xc90-2005-2011-4-4l","title":"O2 Oxygen Sensor Upstream Downstream for Volvo XC90 (2005-2011) 4.4L","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 2005-2011 Volvo XC90 (P2)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This 4-piece oxygen sensor kit restores closed-loop air-fuel ratio monitoring and catalyst diagnostics on the 2005-2011 Volvo XC90 \u003cstrong\u003eP2\u003c\/strong\u003e chassis with the \u003cstrong\u003eB8444S 4.4L V8\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eThe Stock Volvo XC90 Sensor Degradation\u003c\/h3\u003e\u003cp\u003eOn the \u003cstrong\u003eP2\u003c\/strong\u003e XC90 equipped with the \u003cstrong\u003eB8444S 4.4L V8\u003c\/strong\u003e, factory sensors endure severe heat soak inside the tight V8 engine bay. Thermal cycling fatigues internal heater circuits while oil vapor and additives glaze the zirconia sensing element. This contamination slows voltage switching speed and skews fuel trims across both banks, triggering \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0155\u003c\/strong\u003e, or catalyst efficiency codes like \u003cstrong\u003eP0420\u003c\/strong\u003e and \u003cstrong\u003eP0430\u003c\/strong\u003e.\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 \/ DTCs:\u003c\/strong\u003e Triggers \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0150\u003c\/strong\u003e, or \u003cstrong\u003eP0420\/P0430\u003c\/strong\u003e from heater faults or slow switching.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Trim Skew \u0026amp; Rough Idle:\u003c\/strong\u003e Biased voltage feedback causes uneven idling and hesitation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Fuel Consumption:\u003c\/strong\u003e Stuck enrichment increases fuel use and fails emissions.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Matched 4-Sensor Solution\u003c\/h3\u003e\u003cp\u003eReplacing all four sensors simultaneously eliminates cross-bank voltage lag between Bank 1 and Bank 2 on the \u003cstrong\u003eB8444S\u003c\/strong\u003e V8. Each unit pairs a fast-light-off heater with a thermal-shock-resistant zirconia ceramic element and laser-welded stainless housing to block moisture ingress. Pre-terminated OEM-style harnesses route directly into the \u003cstrong\u003eP2\u003c\/strong\u003e exhaust manifolds and mid-pipes without cutting or splicing, matching OEM part numbers \u003cstrong\u003eMHK500870\u003c\/strong\u003e and \u003cstrong\u003e30774700\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2 Upstream Oxygen Sensors\u003c\/li\u003e\n\u003cli\u003e2 Downstream Oxygen Sensors\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;\"\u003e2005-2011 Volvo XC90\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;\"\u003eB8444S 4.4L V8 \/ P2\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 Specs\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eHeated Zirconia Ceramic \/ 4-Sensor Set\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;\"\u003eMHK500870, 30774700\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2005-2011 Volvo XC90 4.4L V8 (\u003cstrong\u003eB8444S\u003c\/strong\u003e) — 4 sensors (2 upstream, 2 downstream)\u003c\/li\u003e\n\u003cli\u003eExcludes 2007-2014 XC90 3.2L models; confirm engine before ordering (Volvo S80 4.4L separate)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the P2 XC90?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Fits 2005-2011 Volvo XC90 \u003cstrong\u003eB8444S 4.4L V8\u003c\/strong\u003e models. \u003cstrong\u003eDoes not fit 3.2L engines; confirm engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0135 or P0420 codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, if faulty sensors are the cause.\u003c\/strong\u003e Replacing the matched \u003cstrong\u003eMHK500870\u003c\/strong\u003e \/ \u003cstrong\u003e30774700\u003c\/strong\u003e set restores closed-loop feedback after verifying zero exhaust leaks.\u003c\/p\u003e\u003ch4\u003eAre all four sensors plug-and-play?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Includes 2 upstream and 2 downstream direct-fit sensors with OEM plugs—torque to spec without contaminating tips.\u003c\/p\u003e\u003ch3\u003eThe Volvo Precision Standard\u003c\/h3\u003e\u003cp\u003eEngineered for accurate ECM closed-loop control, this matched kit restores factory fueling precision and CEL-free emissions compliance on your \u003cstrong\u003eP2\u003c\/strong\u003e XC90 V8.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68119248208120,"sku":"DS-EJNE0ID7O","price":197.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-volvo-xc90-2005-2011-4-4l-1.jpg?v=1794718050","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-volvo-xc90-2005-2011-4-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}