{"product_id":"gm-genuine-parts-heated-oxygen-o2-sensor-afs138-19178961-direct-fit-oe-heated-replacement-for-gm-trucks","title":"GM GENUINE PARTS Heated Oxygen (O2) Sensor AFS138 (19178961) — Direct-Fit OE Heated Replacement for GM Trucks","description":"\u003cp\u003e\u003cstrong\u003eGM Genuine Parts AFS138 (19178961) is a heated oxygen (O2) sensor engineered to replace the original factory unit, helping the engine control module maintain correct air\/fuel balance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis GM-backed heated oxygen sensor monitors exhaust oxygen levels so the vehicle’s engine control module (ECM) can trim fuel delivery and keep combustion close to the target air\/fuel ratio. Built to General Motors OE specifications, the AFS138 is designed for direct fit and reliable operation in compatible Chevrolet, GMC, and Cadillac models. It’s a GM-recommended replacement for the original factory component and carries the durability and validation expected from a genuine OEM part.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this sensor affect engine performance and emissions?\u003c\/h3\u003e\n\u003cp\u003eThe heated oxygen sensor provides real-time feedback on exhaust gas oxygen percentage, enabling the ECM to adjust fuel injection for cleaner combustion and stable engine operation. While it does not change engine design, a properly functioning O2 sensor helps maintain fuel efficiency and supports emission control systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMeasures oxygen content in exhaust to inform fuel trims\u003c\/li\u003e\n  \u003cli\u003eSupports catalytic converter efficiency by maintaining correct air\/fuel ratio\u003c\/li\u003e\n  \u003cli\u003eReduces risk of rough idling or increased fuel consumption when working correctly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat vehicles and fitments does the AFS138 serve?\u003c\/h3\u003e\n\u003cp\u003eThis specific GM Genuine Parts AFS138 (19178961) matches the original equipment specifications for a range of GM trucks and SUVs from late 1990s to early 2000s model years. Always verify the OEM part number and vehicle application before purchase to ensure compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eChevrolet: Avalanche 1500 (2002), Tahoe, Suburban 1500, Silverado 1500 (1999–2002), Silverado 2500 (1999–2000)\u003c\/li\u003e\n  \u003cli\u003eGMC: Yukon\/Yukon XL 1500 (2002), Sierra 1500 (1999–2002), Sierra 2500 (1999–2000)\u003c\/li\u003e\n  \u003cli\u003eCadillac: Escalade (2002)\u003c\/li\u003e\n  \u003cli\u003eConnector type: Female; designed for direct replacement of factory-installed sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose a GM Genuine Parts sensor over an aftermarket option?\u003c\/h3\u003e\n\u003cp\u003eGM Genuine Parts are engineered or validated by General Motors to match the original factory component in fit, form, and function. Choosing an OEM sensor reduces the chance of fitment issues, electrical incompatibility, or reduced durability compared with unknown aftermarket units.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eManufactured to GM OE specifications for consistent performance\u003c\/li\u003e\n  \u003cli\u003eBacked by GM validation and part-number traceability\u003c\/li\u003e\n  \u003cli\u003eConnector and harness compatibility for easier installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow will I know when the oxygen sensor needs replacement?\u003c\/h3\u003e\n\u003cp\u003eSymptoms that suggest an oxygen sensor is failing include a persistent check engine light, reduced fuel economy, or erratic engine idle. Diagnostic trouble codes (DTCs) from an OBD-II scan often indicate the affected sensor bank or circuit, helping you confirm the need for replacement.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCommon signs: check engine light, poor fuel mileage, rough idling\u003c\/li\u003e\n  \u003cli\u003eConfirm with OBD-II codes for O2 sensor or fuel trim abnormalities\u003c\/li\u003e\n  \u003cli\u003eReplace with the GM part number for an exact fit and connector match\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The GM Genuine Parts AFS138 (19178961) heated oxygen sensor is intended for owners and technicians working on compatible Chevrolet, GMC, and Cadillac trucks and SUVs from the listed model years who want a direct OE replacement. If you need a sensor that matches factory specifications, uses the original connector style, and is validated by General Motors for fit and performance, this GM Genuine Parts unit is built for that purpose.\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: Is the AFS138 (19178961) a direct replacement for my GM vehicle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—if your vehicle is listed in the fitment (specific Chevrolet, GMC, Cadillac years) the AFS138 matches OE fit, form, and connector for direct replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this sensor include a heated element?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the AFS138 is a heated oxygen sensor designed to reach operating temperature faster for reliable readings.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GM GENUINE PARTS","offers":[{"title":"Default Title","offer_id":48084071743646,"sku":"B000C9PZHM","price":93.17,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/gm-genuine-parts-afs138-front-view.jpg?v=1785845400","url":"https:\/\/northtrailauto.ca\/products\/gm-genuine-parts-heated-oxygen-o2-sensor-afs138-19178961-direct-fit-oe-heated-replacement-for-gm-trucks","provider":"North Trail Auto","version":"1.0","type":"link"}