How to Add Bluetooth to an Older Car: 5 Options

You can add Bluetooth to an older car in five ways: a Bluetooth AUX adapter, an FM transmitter, a cassette adapter, a USB Bluetooth receiver, or a new head unit. Adapters are cheap and quick but only stream music and sometimes calls. A new head unit is the only option that gives you proper hands-free calling, steering controls and a better screen.

1. Bluetooth AUX adapter

This small receiver plugs into the 3.5 mm AUX socket and powers from a USB port or the 12V socket. Your phone streams music to it over Bluetooth. Sound quality is usually good, but you need an AUX input in the car, and many only stream audio, so check whether the model has a microphone for calls.

2. FM transmitter

An FM transmitter plugs into the 12V socket and broadcasts a short-range signal that you tune the car radio to. It works with almost any car with a radio, but sound quality depends on finding a clear frequency, and it can pick up interference, especially in busy areas.

3. Cassette adapter

If your car has a cassette deck, a Bluetooth cassette adapter plays music through it. It is a niche option for very old cars, and sound quality is fine for casual listening.

4. USB Bluetooth receiver

Some stereos have a USB input that can accept a Bluetooth receiver for audio. Whether it works depends on the stereo, so check before buying.

5. A new head unit

Replacing the stereo is the neat, permanent fix. A new head unit gives you Bluetooth streaming and proper hands-free calling, and usually adds CarPlay and Android Auto, a bigger touchscreen and a reverse camera input. It also keeps your steering wheel controls working when fitted with the right adapter. It is the best choice if you also want maps on the screen or a camera. See car Bluetooth installation in Auckland or head unit installation.

Which should you choose?

You only want music, cheaply: a Bluetooth AUX adapter, if the car has an AUX input.
Your car has no AUX input: an FM transmitter is the simplest workaround.
You want hands-free calls, maps and a modern screen: a new head unit. Read how to choose a car head unit first.

Frequently asked questions

Do Bluetooth adapters give hands-free calls?

Some include a microphone, but many only stream music. A new head unit with Bluetooth gives proper hands-free calling.

Is an FM transmitter good quality?

It is fine for casual listening but can pick up interference, especially in cities. A clear, unused frequency helps.

Can I add Bluetooth and keep my steering wheel controls?

With a head unit installed using the right control adapter, yes. Simple adapters do not use the wheel controls for calls or tracks.

How long does it take to fit a Bluetooth head unit?

Most car stereo installs take 1 to 2 hours, and we come to your home or work anywhere in Auckland.

How to Add Bluetooth to an Older Car: 5 Options Compared