{"product_id":"holley-efi-terminator-x-wideband-adapter-harness","title":"Holley EFI Terminator X Wideband Adapter Harness","description":"\u003cp\u003eThe \u003cstrong\u003eHolley EFI Terminator X Wideband Adapter Harness\u003c\/strong\u003e is a genuine replacement service harness designed specifically for \u003cstrong\u003eHolley Terminator X\u003c\/strong\u003e and \u003cstrong\u003eTerminator X Max\u003c\/strong\u003e EFI systems. This adapter harness connects the wideband oxygen sensor to the ECU, restoring factory functionality when replacing a damaged or worn harness.\u003c\/p\u003e\n\n\u003cp\u003eFeaturing dual factory-style connectors, this service harness is manufactured to maintain proper communication between the ECU and the Bosch wideband oxygen sensor for accurate air\/fuel ratio feedback, self-learning fuel control, and engine tuning.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This harness is designed exclusively for Terminator X and Terminator X Max systems. \u003cstrong\u003eDo not use with Holley HP EFI, Dominator EFI, or Sniper EFI systems\u003c\/strong\u003e, as doing so can damage the wideband oxygen sensor and ECU driver circuitry.\u003c\/p\u003e\n\n\u003ch4\u003eIncludes:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e(1) Holley EFI Terminator X Wideband Adapter Harness\u003c\/li\u003e\n\u003cli\u003e(2) Factory-Style Connectors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\n\u003cdiv class=\"details-content rte\"\u003e\n\n\u003ctable class=\"custom-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eHolley EFI\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e558-463\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eWideband Adapter Harness\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003ePart Type\u003c\/td\u003e\n\u003ctd\u003eMulti-Purpose Wire Connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eReplacement \/ Service Harness\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eConnector Quantity\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eConnector Gender\u003c\/td\u003e\n\u003ctd\u003eFemale\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003chr\u003e\n\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\n\u003cdiv class=\"details-content rte\"\u003e\n\n\u003ctable class=\"custom-specs-table\"\u003e\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\u003cth\u003eHolley EFI System\u003c\/th\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eTerminator X\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eTerminator X Max\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eHP EFI\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eNot Compatible\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eDominator EFI\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eNot Compatible\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eSniper EFI\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eNot Compatible\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFitment Notes\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eDesigned exclusively for Holley Terminator X and Terminator X Max EFI systems.\u003c\/li\u003e\n\u003cli\u003eReplacement service harness for the wideband oxygen sensor connection.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDo NOT install on HP EFI, Dominator EFI, or Sniper EFI systems.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eUsing this harness on incompatible Holley EFI systems can result in wideband oxygen sensor damage and ECU driver failure.\u003c\/li\u003e\n\u003cli\u003eVerify ECU model before installation.\u003c\/li\u003e\n\u003cli\u003eLegal for Racing Use Only vehicles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003chr\u003e\n\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eTech Insight\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\n\u003cdiv class=\"details-content rte\"\u003e\n\n\u003ch3\u003e1. What does this harness do?\u003c\/h3\u003e\n\n\u003cp\u003eThis service harness connects the wideband oxygen sensor to a Holley Terminator X or Terminator X Max ECU, restoring proper communication for air\/fuel ratio monitoring and closed-loop fuel control.\u003c\/p\u003e\n\n\u003ch3\u003e2. Can I use this harness on my Holley Sniper EFI system?\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Holley specifically warns that this harness must not be used with HP EFI, Dominator EFI, or Sniper EFI systems because it can damage both the wideband oxygen sensor and the ECU's wideband driver circuitry.\u003c\/p\u003e\n\n\u003ch3\u003e3. Is this a replacement harness?\u003c\/h3\u003e\n\n\u003cp\u003eYes. This is a genuine Holley replacement\/service harness intended to replace a damaged or worn factory wideband adapter harness.\u003c\/p\u003e\n\n\u003ch3\u003e4. Does this harness include the oxygen sensor?\u003c\/h3\u003e\n\n\u003cp\u003eNo. This listing includes only the adapter harness. The wideband oxygen sensor is sold separately.\u003c\/p\u003e\n\n\u003ch3\u003e5. Is this legal for street vehicles?\u003c\/h3\u003e\n\n\u003cp\u003eNo. Holley classifies this component as a Racing Use Only part intended exclusively for competition vehicles that are not registered for use on public roads.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003chr\u003e","brand":"Holley","offers":[{"title":"Default Title","offer_id":56901569249446,"sku":"558-463","price":66.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8394\/6406\/files\/558-463-Holley-Terminator-X-Wideband-Harness-1.jpg?v=1785792764","url":"https:\/\/wideopendesign.com\/products\/holley-efi-terminator-x-wideband-adapter-harness","provider":"Wide Open Design","version":"1.0","type":"link"}