{"product_id":"o2-oxygen-sensor-upstream-downstream-for-gmc-jimmy-1996-2001-4-3l","title":"O2 Oxygen Sensor Upstream Downstream for GMC Jimmy (1996-2001) 4.3L","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 1996-2001 GMC Jimmy (GMT330)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This matched three-sensor kit restores closed-loop air-fuel metering and catalyst monitoring on the \u003cstrong\u003eGMT330\u003c\/strong\u003e 1996-2001 GMC Jimmy \u003cstrong\u003eL35 4.3L Vortec V6\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eThe Stock GMC Jimmy Sensor Failure\u003c\/h3\u003e\u003cp\u003eOn the \u003cstrong\u003eGMT330\u003c\/strong\u003e chassis with the \u003cstrong\u003eL35 4.3L Vortec V6\u003c\/strong\u003e, factory narrowband oxygen sensors suffer severe exhaust thermal cycling, carbon fouling, and moisture condensation inside the steel Y-pipe. Over time, repeated heat soak fractures the ceramic zirconia substrate while internal heater windings corrode and open-circuit. This sluggish voltage-switching response forces the PCM out of closed-loop fuel control, triggering \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0141\u003c\/strong\u003e, \u003cstrong\u003eP0155\u003c\/strong\u003e, and lean fuel-trim faults like \u003cstrong\u003eP0171\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 \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0141\u003c\/strong\u003e, or \u003cstrong\u003eP0155\u003c\/strong\u003e triggered by open heater circuits or slow switching.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRich\/Lean Misfire Signs:\u003c\/strong\u003e Fuel-trim drift (\u003cstrong\u003eP0171\u003c\/strong\u003e) causes rough idle, black exhaust soot, and hesitation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFailed Emissions \u0026amp; MPG Loss:\u003c\/strong\u003e Stuck PCM enrichment wastes fuel and fails OBD-II readiness tests.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Zirconia Oxygen Sensors Solution\u003c\/h3\u003e\u003cp\u003eEach sensor in this matched kit pairs a fast-light-off \u003cstrong\u003e4-wire heated zirconia ceramic\u003c\/strong\u003e element with a laser-welded \u003cstrong\u003estainless steel housing\u003c\/strong\u003e to resist moisture intrusion and exhaust gas contamination. Pre-coated anti-seize threads and OEM-length wiring harnesses with factory connectors allow true plug-and-play installation without splicing. Replacing both upstream \u003cstrong\u003eBank 1\/Bank 2\u003c\/strong\u003e sensors and the downstream catalytic monitor restores crisp closed-loop voltage switching between \u003cstrong\u003e0.1V and 0.9V\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\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;\"\u003e1996-2001 GMC Jimmy\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;\"\u003eL35 4.3L Vortec V6 \/ GMT330\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; Substrate\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e4-Wire Heated \/ 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\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e1996-2001 GMC Jimmy 4.3L\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the GMT330 Jimmy?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Direct fit for the 1996-2001 GMC Jimmy \u003cstrong\u003eL35 4.3L Vortec V6\u003c\/strong\u003e. \u003cstrong\u003eConfirm your 4.3L engine and 3-sensor exhaust layout before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0135, P0141, or P0155 codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, when caused by worn sensors.\u003c\/strong\u003e New sensors restore proper heater resistance and voltage switching, clearing \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0141\u003c\/strong\u003e, and \u003cstrong\u003eP0155\u003c\/strong\u003e once codes are reset.\u003c\/p\u003e\u003ch4\u003eAre connectors and install prep included?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Direct-fit harnesses plug straight into OEM connectors. Use a \u003cstrong\u003e22mm (7\/8\") O2 socket\u003c\/strong\u003e and avoid contaminating the sensor tip.\u003c\/p\u003e\u003ch3\u003eThe GMC Heavy-Duty Standard\u003c\/h3\u003e\u003cp\u003eEngineered for thermal durability under towing and daily load on the \u003cstrong\u003eGMT330\u003c\/strong\u003e chassis, this kit keeps your \u003cstrong\u003eL35 4.3L Vortec V6\u003c\/strong\u003e running clean and CEL-free. Restore factory fuel trim accuracy with every mile.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68115817988344,"sku":"DS-ESZON5SJC","price":57.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-gmc-jimmy-1996-2001-4-3l-1.jpg?v=1794709366","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-gmc-jimmy-1996-2001-4-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}