Street. Track. Everything between.
Your garage Find parts for your vehicle Select year, make and model to narrow your search.

Holley Dominator EFI Auxiliary Harnesses 558-401 Fuel Injection Systems Wiring Harnesses, EFI, J2A Harness, MPFI, Speed Density/Throttle Metered, with Wideband O2 Sensor, Kit

Holley Dominator EFI Auxiliary Harnesses 558-401 Fuel Injection Systems Wiring Harnesses, EFI, J2A Harness, MPFI, Speed Density/Throttle Metered, with Wideband O2 Sensor, Kit

A$567.44
IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
View cart 0
We accept
American Express
Mastercard
Visa
PayPal Checkout
Direct Deposit
Afterpay
Apple Pay
Google Pay
Zip Pay

Description

Holley has put together a choice of several Dominator EFI auxiliary harnesses. These kits include the loose wires, connectors, inputs, and outputs needed to configure and customize your Dominator EFI system to meet your performance needs.

Part Type

Auxiliary Harness J2A Connector

Data: v4.2 - Upd: 2026-10-14 02:05:59

Specifications

Product Attributes - Brand
Holley
Product Attributes - Manufacturer's Part Number
558-401
Product Attributes - Part Type
Fuel Injection System Wiring Harnesses
Product Attributes - Product Line
Holley Dominator EFI Auxiliary Harnesses
Product Attributes - UPC
090127666425
Product Attributes - Fuel Injection Style
Multi-port
Product Attributes - Metering Style
Speed density (Map-N) or speed throttle (Alpha-N)
Product Attributes - Quantity
Sold as a kit.
Product Attributes - Notes
Includes J2A ECU connector, wide band oxygen sensor harness, and 23 programmable input loose wires with pins.

Reference Information

Brand Name/s Holley
StreetFX SKU hly558-401
SFX Item ID 4783046
Supplier Item Code 4783046
Manufacturer SKU 558-401
Manufacturer UPC 90127666425
Alternative References HOL558-401, J2A

Compatibility

Loading compatibility information...