Key Functions:

• Converts wiring between engine types
• Supports OBD1 to OBD2 ECU conversion
• Maintains proper sensor and ECU communication
• Eliminates cutting and splicing factory wiring

Product Overview: B-Series to D-Series Conversion Harness

This adapter harness is designed for durability, ease of use, and reliable performance in swap applications.

Specification:

• Condition: Brand New
• Material: ABS, Reinforced Rubber
• Operating Voltage: 12V DC
• Installation: Plug & Play, direct fit
• Application: Conversion engine harness for B Series to D Series chassis swap
• Compatibility: OBD1 to OBD2 adapter for performance upgrades
• High Heat Resistance: Designed to resist extreme engine temperatures

Key Features:

• Plug-and-play design for easy installation
• Compatible with 1996–1998 Honda Civic Si EK
• B-series to D-series wiring adaptation
• OBD1 to OBD2 conversion support
• High heat-resistant wiring materials
• Durable connectors for long-term reliability

Compatible Vehicles

Honda Models:

• Civic Si EK (1996–1998)

(Designed for B-series and D-series engine swap applications. Always verify ECU and wiring compatibility.)

This chassis wiring harness is compatible with the next vehicles:

✔ Honda Civic Si EK 1996-1998, compatible with 2000 Honda Civic Si engine harness

✔ Supports B Series to D Series engine swaps

✔ Compatible with OBD1 and OBD2 wiring systems

✔ Ideal for Honda performance upgrades and ECU tuning

Note:

• Ensure that the part number matches your original before purchasing.
• Plug immediately into the engine wiring harness for simple installation.
• This chassis adapter harness is designed for performance upgrades and engine swaps.

Why Use an Adapter Harness?

Instead of modifying your factory wiring, this harness allows you to:

• Save time during installation
• Avoid wiring errors
• Maintain OEM-style connections
• Improve reliability and troubleshooting

Package Included:

1 × B Series Chassis Adapter Harness

Compatible with Honda Civic Si EK 1996-2000: This chassis wiring harness is specifically designed for Honda Civic Si EK 1996-1998 and compatible with 2000 Honda Civic Si engine harness, taking into account a seamless B Series to D Series engine conversion whilst maintaining OBD1 to OBD2 compatibility. Ideal for Honda enthusiasts and professional tuners.
Plug & Play Installation – No Wire Cutting Required: The B Series chassis adapter harness is a true plug-and-play solution, pre-wired for quick installation without the need for splicing or modifications, making it highest for DIY mechanics and professional installers. The wiring engine harness for Civic ensures a smooth and efficient upgrade process.

Ideal For:

• B-series to D-series engine swaps
• OBD1 to OBD2 ECU conversions
• Civic EK performance builds
• DIY and professional installers

Installation Notes

• Plug-and-play between engine and chassis harness
• Verify ECU compatibility before installation
• No cutting or splicing required
• Professional installation recommended for best results

Optimized ECU Data Transfer & Fuel Efficiency: This conversion engine harness is designed to support ECU data transmission, ensuring accurate sensor readings, smoother fuel injection, and overall improved fuel efficiency and engine response.

Performance Benefits

Using a proper conversion harness can:

• Ensure reliable engine startup
• Prevent electrical issues and misfires
• Improve ECU communication
• Simplify future maintenance and diagnostics

High-Temperature Resistant & Durable Materials: Comprised of high-quality ABS and reinforced rubber, this Civic EK wiring harness withstands high temperatures and harsh driving conditions, preventing overheating and premature wear.

Frequently Asked Questions

How do I swap OBDI or OBDII with a Honda engine swap? How do I convert OBD between my VTEC engines?

Learn how to convert OBD2 to OBD1 using this DIY article or if you want to convert OBD0 to OBD1 use this guide instead.

Do I need this harness for an engine swap?

Yes, if you’re mixing engine types or ECU generations, an adapter harness is essential.

Is this plug-and-play?

Yes, it is designed to connect directly without cutting or modifying wiring.

Will this improve performance?

Not directly, but it ensures proper operation and reliability of your engine setup.

Ideal for Engine Swap & Performance Upgrades: Designed for Honda B Series and D Series conversions, this OBD1 to OBD2 adapter harness allows seamless integration of upgraded engines, making it a very good choice for performance-focused modifications.

Conclusion

This B-series to D-series adapter harness is an essential tool for simplifying your Honda Civic EK engine swap. With plug-and-play functionality and high heat resistance, it provides a reliable and professional wiring solution for your build.