Replace the Key Fob Battery

Last updated: June 8, 2026

If the flip key on your Alfa Romeo 159 (2005–2012) has lost its range or the central locking has gone intermittent, the coin cell inside is almost certainly flat. It’s a quick swap with a CR2032.

Battery First — What You Need

• A CR2032 coin cell.
• A small flat screwdriver.

The 159’s flip key still turns the ignition mechanically with a dead fob, so you can always start the car; the cell only powers the remote locking.

Replacing the Cell

1. Flip out the metal key blade.
2. Split the fob case at the seam with a small screwdriver (some have a small screw to remove first).
3. Lift out the old cell (don’t touch the terminals).
4. Fit a new CR2032, observing the correct polarity.
5. Reassemble and close the blade.

Lost Key or Adding a Spare

A cell swap keeps the existing coding. The 159 can hold up to 8 keys, but programming a new one needs the repair code from the car’s security card and a dealer diagnostic tool — there’s no owner sequence.

If a Fresh Cell Doesn’t Help

• Check the polarity — an upside-down cell won’t work.
• Use the key blade to lock/unlock in the meantime.
• Still intermittent? A receiver fault can store a code — look it up on autodtcs.com.

Frequently Asked Questions

What battery does the Alfa Romeo 159 key use?

A single CR2032 coin cell.

Do I need to reprogram the key after the swap?

No — the coding is retained for a battery change.

Can I program a new 159 key myself?

No — it needs the repair code from the security card and a dealer tool.

The fob is dead — can I still drive?

Yes — the metal blade unlocks the door and turns the ignition.

If the fob stopped working after a battery disconnection, see our 159 battery disconnect/reconnect guide.