Metra 40-VW21 Antenna Adapter for Mercedes Factory Radio

The Metra 40-VW21 Factory Radio Antenna Adapter is used during radio replacement or FM-modulator installation in select Mercedes-Benz applications using a flat European-style factory radio antenna connector. It adapts the vehicle antenna connection so the factory antenna system can work with the new radio or connected device when the factory plug does not directly match.

At a Glance

• Adapts an aftermarket antenna cable to the vehicle original factory radio
• Female Motorola connector on one end
• Volkswagen/Audi European-style flat connector on the other end
• No internal capacitor, helping avoid reception issues on some European vehicles
• Helps retain AM/FM antenna reception during compatible installations
• Designed for vehicle-specific antenna connector applications

Exact Vehicle Compatibility

Find your vehicle below, then match the model year and factory-equipment details in the same row. Factory radio, amplifier, navigation, trim, speaker location, and connector differences can change which installation parts are required. If anything differs, contact MCOR before ordering.

Fitment note: Year and model alone are not always enough to confirm compatibility. Match every factory-equipment qualifier shown for your vehicle, and contact MCOR Automotive if the radio, amplifier, navigation, speaker, camera, trim, or connector details are uncertain.

Installation Notes

• Confirm exact year, make, model, trim level, factory radio, and factory audio system before installation
• Test-fit the antenna adapter and review manufacturer instructions before final assembly
• Additional parts may be required depending on vehicle equipment and the aftermarket radio or accessory being installed
• Professional installation is recommended for best fit, wiring integrity, and long-term reliability

What's in the Box

• Antenna adapter cable as supplied by Metra

Technical Specifications

• Brand: Metra
• Model: 40-VW21
• Product Type: Factory radio antenna adapter cable
• Application: Select Mercedes-Benz vehicles
• Antenna Side Connector: Female Motorola
• Radio Side Connector: Volkswagen/Audi European-style flat connector
• Compatibility Type: Aftermarket antenna to factory radio

Identifiers & Packaging

• MPN: 40-VW21
• UPC: 086429056736
• Sold As: Each
• Included Components: Antenna adapter cable as supplied by Metra

Why Buy From MCOR Automotive

• Authorized retailer for the brands we sell
• Specialists in vehicle audio integration, radio replacement parts, and installation accessories
• 22+ years of professional automotive electronics experience
• Expert support for compatibility verification and proper setup