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Small black plastic antenna adapter with two coaxial connectors

METRA

METRA 40-KI21 Antenna Adapter car electronics accessory

SKU CH-9HZF-6E6DP

Connects a factory radio to an aftermarket antenna in compatible Hyundai and Kia models from 2009 to 2017

  • Connects factory radio to aftermarket antenna
  • Fits Hyundai Accent models from 2009 to 2011
  • Compatible with Kia Forte from 2010 to 2013
  • Supports Hyundai Elantra with navigation 2017 onward
  • Works with Kia Sorento navigation models from 2016

Factory Antenna Adapter for Hyundai and Kia

The METRA 40-KI21 connects a factory radio antenna cable to an aftermarket head unit. It is designed for installers and owners replacing the original stereo in compatible Hyundai and Kia vehicles. The adapter bridges the proprietary connector to a standard aftermarket antenna plug without cutting the harness.

Vehicles with listed factory radio configurations

This adapter suits the Hyundai and Kia models and model years shown in the application list when retaining the factory antenna. It is not for vehicles outside the listed range or for installations that use a powered antenna amplifier requiring a different interface. Builders fitting a non-standard tuner should verify the antenna connector type before purchase.

Connector interface matches factory antenna plug

The single specification that decides fitment is the adapter's connector profile, which matches the factory antenna socket on the listed Hyundai and Kia applications. If the vehicle's antenna connector differs from the factory original shown for that model and year, this adapter will not mate correctly.

Highlights

  • Connects factory radio to aftermarket antenna
  • Fits Hyundai Accent models from 2009 to 2011
  • Compatible with Kia Forte from 2010 to 2013
  • Supports Hyundai Elantra with navigation 2017 onward
  • Works with Kia Sorento navigation models from 2016

Specifications

No published specifications for this item yet.

Questions about this item

How do I connect the 40-KI21 between my factory radio and the aftermarket antenna?

Plug the adapter's factory-side connector into the vehicle's antenna lead, then plug the aftermarket antenna cable into the adapter's opposite end. The step most people miss is confirming the vehicle is listed for 2009-2017 applications before installing.

Will the 40-KI21 adapter itself need periodic replacement?

The adapter is a passive connector with no moving parts or electronics, so it does not wear out. Only the antenna cable or factory radio connector would need attention if they become corroded or damaged over time.

What signal loss appears first when driving long distances with the 40-KI21 installed?

The adapter adds no amplification, so the first limit is the factory antenna's own reception range. In fringe areas the radio will lose station lock exactly as it would without the adapter.

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