Rywire BMW E30 K20 Swap Conversion Harness - 2002-2004 K20A Into 1988-1992 E30 (E30-K20A)

Rywire E30-K20A is a plug-and-play chassis adapter harness for putting a 2002-2004 Honda K20 into a 1988-1992 BMW E30. It joins the K20 engine harness to the round E30 chassis interface connector, carries the engine computer connector and main relay, and keeps the factory BMW coolant temperature gauge reading.

Why This E30 K20 Swap Conversion Harness

The Rywire E30-K20A is a K20 swap conversion harness that plugs a 2002-2004 Honda K20 engine harness into the round chassis interface connector of a 1988-1992 BMW E30.

• Versus splicing into BMW wiring: This E30 conversion harness is plug and play at the E30 round connector and the K20 C101 connector, so Honda and BMW circuits are not mapped wire by wire.
• Versus building the interface yourself: This E30 conversion harness already carries the K20 engine computer connector, computer relay, primary O2 wiring and relay, and relay ground terminal.
• Factory gauge keeps working: This E30 conversion harness includes the E30 BMW coolant temperature sender, so the OEM E30 gauge cluster still reads coolant temperature.
• Fan control your way: This E30 conversion harness provides a loose green wire for electric fan control, so the fan can be wired to suit the car's cooling setup.

Best for: A 2002-2004 Honda K20 going into a 1988-1992 BMW E30.

Engine Swap Fitment

• Chassis: 1988-1992 BMW E30
• Engine: 2002-2004 Honda K20

Features

• Plug and play to the E30 round chassis interface connector
• K20 C101 connector to the engine harness
• Primary O2 sensor wiring and relay built in
• BMW coolant temperature sender so the OEM E30 gauge cluster still reads
• Loose green wire for electric fan control

Connector List

• K20 C101 connector
• K20 engine computer connector
• K20 primary O2 wiring and relay
• E30 BMW round chassis interface connector
• E30 BMW coolant temperature sender for the OEM gauge cluster
• Ground terminal for the relay ground
• Computer relay
• Green fan control wire

What's Included

• E30 to K20A conversion harness with the connectors listed above
• Computer relay

Frequently Asked Questions

Which K20 does this support?

Rywire built it for the 2002-2004 K20.

Does my BMW temperature gauge still work?

Yes. The harness includes the E30 BMW coolant temperature sender for the factory gauge cluster.

How do I run the electric fan?

A loose green wire is provided for electric fan control. Email service@tunedbyshawn.com with your engine, chassis and ECU before ordering if you are unsure which configuration you need.

Does the BMW temperature gauge still work after a K20 swap with this harness?

Yes. The Rywire E30 K20 conversion harness includes the E30 BMW coolant temperature sender, so the factory E30 gauge cluster keeps reading coolant temperature.

For off-road and competition use only. Not legal for use on pollution-controlled motor vehicles.