{"product_id":"o2-oxygen-sensor-upstream-downstream-for-pontiac-bonneville-2004-2005-3-8l","title":"O2 Oxygen Sensor Upstream Downstream for Pontiac Bonneville (2004-2005) 3.8L","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 2004-2005 Pontiac Bonneville (G-Body)\u003c\/h2\u003e\n\n\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 efficiency tracking on the 2004-2005 Pontiac Bonneville \u003cstrong\u003eL36 3.8L V6\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Pontiac Bonneville Sensor Failure\u003c\/h3\u003e\n\u003cp\u003eOn the \u003cstrong\u003eG-Body\u003c\/strong\u003e Bonneville equipped with the \u003cstrong\u003eL36 3.8L V6\u003c\/strong\u003e, factory oxygen sensors endure extreme exhaust thermal cycling, carbon fouling, and oil or coolant ash contamination. Over time, internal heater circuits burn out and zirconia sensing elements lose responsiveness between 0.1V and 0.9V. When the PCM detects sluggish switching or open heater resistance, it triggers \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0141\u003c\/strong\u003e, or \u003cstrong\u003eP0171\u003c\/strong\u003e fault codes and forces rich open-loop fueling.\u003c\/p\u003e\n\n\u003ch4\u003eCommon Symptoms of a Failing OEM Oxygen Sensor\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCheck Engine Light \u0026amp; Heater Codes:\u003c\/strong\u003e Logs \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0141\u003c\/strong\u003e, or \u003cstrong\u003eP0133\u003c\/strong\u003e from burnt heater elements or slow sensor response.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFuel Trim \u0026amp; Idle Instability:\u003c\/strong\u003e Skewed voltage feedback forces rich fueling, causing rough idle and \u003cstrong\u003eP0300\u003c\/strong\u003e misfires.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFailed Emissions \u0026amp; MPG Loss:\u003c\/strong\u003e Open-loop operation raises exhaust hydrocarbons and reduces highway fuel economy.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Direct-Fit Matched Sensor Solution\u003c\/h3\u003e\n\u003cp\u003eReplacing both sensors as a matched set restores synchronized pre-catalyst fuel trim feedback and post-catalyst monitoring across the \u003cstrong\u003eL36 3.8L\u003c\/strong\u003e exhaust. Each direct-fit sensor utilizes a corrosion-resistant stainless steel shell, high-temperature ceramic zirconia core, and factory-calibrated internal heater element. Pre-coated threads and OEM-style weatherpack connectors eliminate splicing, ensuring plug-and-play installation and rapid closed-loop activation from cold start.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1x Upstream Oxygen Sensor\u003c\/li\u003e\n  \u003cli\u003e1x Downstream Oxygen Sensor\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;\"\u003e2004-2005 Pontiac Bonneville\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;\"\u003eL36 3.8L V6 \/ G-Body\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 Architecture\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eHeated Zirconia \/ Direct-Fit OEM Connector\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\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004 Pontiac Bonneville 3.8L V6 (1 Upstream \u0026amp; 1 Downstream)\u003c\/li\u003e\n  \u003cli\u003e2005 Pontiac Bonneville 3.8L V6 (1 Upstream \u0026amp; 1 Downstream)\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 G-Body Bonneville?\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Fits the 2004-2005 Pontiac Bonneville with the \u003cstrong\u003eL36 3.8L V6\u003c\/strong\u003e engine. \u003cstrong\u003eExcludes 4.6L V8 GXP models and earlier years; verify engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eWill this clear P0135, P0141, and P0420 codes?\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eYes, for sensor-related faults.\u003c\/strong\u003e Restores voltage switching and heater resistance for \u003cstrong\u003eP0135\u003c\/strong\u003e and \u003cstrong\u003eP0141\u003c\/strong\u003e; persistent \u003cstrong\u003eP0420\u003c\/strong\u003e codes indicate a failed catalytic converter.\u003c\/p\u003e\n\n\u003ch4\u003eIs any wiring modification required for installation?\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Both sensors include OEM-style connectors for direct plug-and-play installation into factory \u003cstrong\u003eG-Body\u003c\/strong\u003e exhaust bungs.\u003c\/p\u003e\n\n\u003ch3\u003eThe Pontiac Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for factory PCM accuracy, this matched sensor set keeps your \u003cstrong\u003eL36 3.8L\u003c\/strong\u003e emissions-compliant and CEL-free. Direct-fit connectors ensure reliable fueling performance under daily thermal cycling.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68119476109560,"sku":"DS-EXK294PJ0","price":31.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-pontiac-bonneville-2004-2005-3-8l-1.jpg?v=1794723279","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-pontiac-bonneville-2004-2005-3-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}