Honda K-Series Plug & Play Street-Spec Engine Wiring Harness

This Street-Spec K-Series engine wiring harness is designed for Honda K-Series engine swaps and performance builds, providing a clean, plug-and-play solution with modern routing flexibility. Built using brand-new OEM-style connectors and high-quality automotive wiring, this harness delivers reliable operation while supporting clean engine bay layouts.

No core is required, and each harness is built new to ensure proper fitment and long-term durability.

Version 3 Universal Routing Design

Version 3 of our K-Series engine harness was developed to support a more universal chassis application and routing preference. Unlike earlier revisions, this design allows routing through the center or passenger side of the firewall, closely mimicking OEM K-Series harness layouts.

This routing style is ideal for RHD chassis, but is not exclusive to RHD applications and works equally well in LHD vehicles. The updated routing also improves clearance around aggressive headers and turbo manifolds, making it well-suited for performance and forced-induction builds.

Improved Tuck Split & Clean Engine Bay Layout

The Version 3 harness design introduces a refined tuck split for a cleaner and more organized engine bay compared to Version 1 and Version 2 harnesses. Wiring branches are optimized for serviceability while maintaining a low-visibility, professional appearance.

Each harness is pin-to-pin tested to ensure proper continuity and sensor operation before shipment.

Street-Spec Construction with Premium Loom Options

These Street-Spec K-Series harnesses are offered with premium loom options to suit different build goals and environments:

Selectable loom options include:

• Raychem-style heat-resistant loom (DR-25 alternative)

• Flame-resistant expandable loom (black with white tracer)

All harnesses are built using Teflon Coated High Quality wire, offering increased heat resistance and durability compared to standard TXL wiring while remaining cost-effective for street and track applications.

Selectable Configuration Options

This K-Series Street-Spec harness is offered as a configurable product, allowing key components to be selected via dropdown to match your application.

Selectable options include:

• Injector connector type

• Chassis subharness options

• Model year configuration – 02–04 RSX style (standard) or 05–06 variant

All options are selected at checkout. Compatibility is determined by engine, chassis, and ECU selection.

Compatibility Notes & Requirements

Please review the following prior to purchase:

• Charge harness not included and must be run independently

• Requires high-impedance fuel injectors

• Not compatible with injector resistor boxes

• Designed around 02–04 RSX-style sensor configuration by default

• Separate harness variant available for 05–06 K-Series setups

Included Connections (Reference Only)

Connections included on this harness may include the following, depending on configuration:

• VTEC solenoid

• VTC

• VTP

• Oil pressure sending unit

• Crank position sensor (02–04 K20 style)

• Ignition coils 1–4

• Cam position sensor (exhaust side)

• Top dead center sensor (intake side)

• Engine coolant temperature sensor (02–04 K20 style)

• Knock sensor (02–04 K20 style)

• Intake air temperature sensor

• Alternator (02–04 K20 style)

• MAP sensor

• TPS

• Idle control motor

• Vehicle speed sensor (electronic)

• Fuel injectors 1–4

• Coolant temp sender (cluster)

• Reverse lights

• Reverse lockout solenoid

• Starter signal

• ECU connectors A and B

• Power distribution cap

• Ground

• 6 × auxiliary wires

• 2 × heavy-gauge fan wires with OBD1-style fan connector
  (ECU-side relay required for fan control)