{"product_id":"o2-oxygen-sensor-new-replacement-4-pin","title":"O2 Oxygen Sensor – New Replacement (4-Pin)","description":"\u003cp data-start=\"226\" data-end=\"542\"\u003eNew replacement narrowband oxygen sensor for 1986–1987 Turbo Buick 3.8L engines equipped with the factory ECM and wiring harness. Critical for accurate fuel control in closed-loop operation, idle quality, cruise air-fuel correction, and overall drivability.\u003c\/p\u003e\n\u003cp data-start=\"544\" data-end=\"583\"\u003e🔵 \u003cstrong data-start=\"547\" data-end=\"583\"\u003eBlue Dot – New \/ Never Installed\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"585\" data-end=\"994\"\u003e\u003cstrong data-start=\"585\" data-end=\"604\"\u003eSpecifications:\u003c\/strong\u003e\u003cbr\u003e• Application: Narrowband O2 Oxygen Sensor\u003cbr data-start=\"647\" data-end=\"650\"\u003e• Fitment: 1986–1987 Buick Grand National \/ GNX \/ Turbo T \/ T-Type\u003cbr data-start=\"716\" data-end=\"719\"\u003e• Connector Style: 0258007057 4-pin OEM-style plug\u003cbr data-start=\"758\" data-end=\"761\"\u003e• Wiring: Pre-wired pigtail with insulation and retaining clips\u003cbr data-start=\"824\" data-end=\"827\"\u003e• Function: Monitors exhaust oxygen level to maintain proper AFR\u003cbr data-start=\"891\" data-end=\"894\"\u003e• Thread Size: Standard Turbo Buick exhaust bung\u003cbr data-start=\"942\" data-end=\"945\"\u003e• Condition: New — protective cap still installed\u003c\/p\u003e\n\u003cp data-start=\"996\" data-end=\"1171\"\u003e\u003cstrong data-start=\"996\" data-end=\"1016\"\u003eCondition Notes:\u003c\/strong\u003e\u003cbr\u003e• New — never exposed to exhaust heat\u003cbr data-start=\"1054\" data-end=\"1057\"\u003e• Clean terminals, tight connector lock tab\u003cbr data-start=\"1100\" data-end=\"1103\"\u003e• No corrosion or discoloration\u003cbr data-start=\"1134\" data-end=\"1137\"\u003e• Wrapped harness and clips intact\u003c\/p\u003e\n\u003cp data-start=\"1173\" data-end=\"1505\"\u003e\u003cstrong data-start=\"1173\" data-end=\"1193\"\u003eWhy You Want It:\u003c\/strong\u003e\u003cbr\u003eA weak, contaminated, or slow-responding O2 sensor can cause rich\/lean fluctuations, poor fuel mileage, bogging, hesitation, or tuning issues. Replacing it restores accurate closed-loop response and keeps drivability clean — especially beneficial before dyno tuning, chip upgrades, or performance modifications.\u003c\/p\u003e\n\u003cp data-start=\"1507\" data-end=\"1648\"\u003e⚠️ All Turbo 6 Parts are sold as-is with no returns, refunds, or exchanges. Buyer is responsible for verifying compatibility before purchase.\u003c\/p\u003e","brand":"Watts Performance Solutions","offers":[{"title":"Default Title","offer_id":42599567753279,"sku":"pauls","price":30.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0570\/2310\/3039\/files\/ScreenShot2025-11-20at12.32.44PM.png?v=1763660186","url":"https:\/\/wattsperformance.com\/products\/o2-oxygen-sensor-new-replacement-4-pin","provider":"Watts Performance Solutions","version":"1.0","type":"link"}