{"product_id":"a-premium-o2-oxygen-sensor-4-pack-for-gm-5-3l-v8-2003-2005-heated-4-wire-upstream-downstream","title":"A-Premium O2 Oxygen Sensor 4-Pack for GM 5.3L V8 (2003–2005) — Heated 4-Wire Upstream \u0026 Downstream","description":"\u003cp\u003e\u003cstrong\u003eA-Premium 4-pack of heated upstream and downstream O2 oxygen sensors replaces worn sensors to restore accurate air-fuel monitoring for GM 5.3L V8 engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your 2003–2005 GM truck or SUV is showing reduced fuel economy, rough idle, or a check-engine light related to oxygen sensors, this A-Premium four-pack gives you both upstream and downstream replacements in one purchase. These threaded, 4-wire heated sensors are built to the original-style specifications and packaged as a convenient boxed set for quick installation without specialty tools.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles will these oxygen sensors fit?\u003c\/h3\u003e\n\u003cp\u003eThese sensors are designed for GM full-size trucks and SUVs with the 5.3L V8 engine from the 2003–2005 model years. Fitment covers upstream and downstream positions where the factory sensors are threaded into the exhaust system. Always verify your vehicle’s OEM part number to confirm compatibility before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCadillac Escalade 2005 – V8 5.3L\u003c\/li\u003e\n  \u003cli\u003eChevrolet Silverado 1500 2004–2005 – V8 5.3L\u003c\/li\u003e\n  \u003cli\u003eChevrolet Suburban 1500 2003–2004 – V8 5.3L\u003c\/li\u003e\n  \u003cli\u003eChevrolet Tahoe 2003–2005 – V8 5.3L\u003c\/li\u003e\n  \u003cli\u003eGMC Sierra 1500 2003–2005 and Yukon\/Yukon XL 1500 2003–2004 – V8 5.3L\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow are these sensors constructed and what specifications matter?\u003c\/h3\u003e\n\u003cp\u003eEach sensor is a heated, threaded unit with a 4-wire female connector designed to match original equipment electrical and thermal behavior. The heating element helps the sensing tip reach operating temperature faster for reliable emissions monitoring and shorter closed-loop operation after startup.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSensor locations: upstream (pre-catalyst) and downstream (post-catalyst)\u003c\/li\u003e\n  \u003cli\u003eType: heated oxygen sensor with threaded mounting\u003c\/li\u003e\n  \u003cli\u003eConnector: female, 4-wire harness compatible with listed GM models\u003c\/li\u003e\n  \u003cli\u003eSold as a package of four sensors in a protective box\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill installation be difficult and what tools do I need?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for anyone familiar with basic under-vehicle work. The threaded design and standard connector let you swap sensors without cutting or splicing; typical removal requires penetrating oil and an oxygen sensor socket or appropriate wrench.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNo special wiring or adaptors required\u003c\/li\u003e\n  \u003cli\u003eUse an O2 sensor socket or 22mm wrench and a ratchet\u003c\/li\u003e\n  \u003cli\u003eApply anti-seize where recommended to ease future removal\u003c\/li\u003e\n  \u003cli\u003eReconnect the electrical harness securely and clear any codes after replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this 4-pack best suited for? Drivers and DIY mechanics who own compatible Cadillac, Chevrolet, or GMC GM 5.3L V8 trucks and SUVs and prefer to replace all oxygen sensors at once will appreciate the value and convenience. Fleet owners, preventative-maintenance enthusiasts, and those troubleshooting persistent oxygen-sensor-related codes benefit from having both upstream and downstream sensors included.\u003c\/p\u003e\n\n\u003cp\u003eBuilt from durable materials and shipped in a protective box, these A-Premium sensors include cross-reference compatibility with many OEM and aftermarket part numbers for an easier match. A-Premium backs every O2 sensor with a one-year unlimited-mileage guarantee so you can install replacements with confidence.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these sensors match OEM part numbers?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The sensors cross-reference many OEM numbers listed and are designed to match original fit and function for compatible GM 5.3L models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is special wiring required to install these sensors?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No special wiring is needed; they use a 4-wire female connector to plug into the factory harness for direct replacement.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"A-Premium","offers":[{"title":"Default Title","offer_id":48084011483294,"sku":"B07CRHPXTS","price":78.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/a-premium-front-packaging_8246f36c-d742-46fd-8d3e-5a9a7dd71e75.jpg?v=1785843380","url":"https:\/\/northtrailauto.ca\/products\/a-premium-o2-oxygen-sensor-4-pack-for-gm-5-3l-v8-2003-2005-heated-4-wire-upstream-downstream","provider":"North Trail Auto","version":"1.0","type":"link"}