These instructions apply to the Peugeot 208 Mk1 (A9, A91) 2012-2019.
For other models, please choose your vehicle here.
A Peugeot 208 Mk1 (2012–2019) remote that only works close to the car, needs several presses, or has stopped responding is nearly always down to a flat coin cell. The swap is quick, and unlike many cars the 208 has a genuine owner re-synchronisation you can run yourself if the remote drifts out of step. Here is the full job, plus the limit on programming a new key.
Battery First
The 208 fob uses a CR2032 coin cell (some early flip-key remotes use a CR1620 — check the old one). A weak cell causes almost every unreliable-remote complaint, so fit a fresh one before suspecting anything else. The integrated blade always opens the driver’s door.
Replacing the Fob Battery
- Remove the key cover — ease the case open at the seam with a small screwdriver.
- Lift out the old cell (CR2032, or CR1620 on some flip keys).
- Fit the new cell the same way round, handling it by the edge.
- Refit the cover and check each remote will lock and unlock the car.
Re-synchronising the Remote (Owner Procedure)
If the remote stops working after the battery has been flat — or after a swap — the 208 re-pairs without any tool:
- Turn the ignition off, then on.
- Press the lock button on the remote once.
- Turn the ignition off and remove the key.
- The remote is synchronised — test lock and unlock.
Tip: make a careful note of the key number printed on the label that came with the key, and don’t repeatedly press the remote out of range — that can desynchronise it in the first place.
Lost Key or Adding a Spare
The resync above only works for a remote the car already knows. Coding a brand-new key involves the immobiliser and needs Peugeot dealer or auto-locksmith equipment.
If a New Cell and Resync Don’t Help
- Check polarity and the contacts — the usual reasons a swap fails.
- Confirm the cell size — fitting a CR1620 where a CR2032 belongs (or vice-versa) gives poor contact.
- Still dead? A BSI or receiver fault may be storing a code — look it up on autodtcs.com.
Frequently Asked Questions
What battery does the 208 Mk1 key fob use?
Usually a CR2032; some early flip-key remotes use a CR1620 — always check the old cell.
Do I need a dealer to resync the remote?
No — the ignition-on, press-lock, ignition-off sequence above re-pairs an existing remote with no tool.
Can I program a new 208 key myself?
No — a new key must be coded to the immobiliser by a dealer or locksmith.
Why did my remote lose sync?
Often a flat cell, or repeatedly pressing the buttons out of range of the car — the resync restores it.
If the remote went quiet right after a battery disconnection, our 208 Mk1 battery disconnect/reconnect guide covers the resync in context.
Independent guide — not affiliated with Peugeot. Always follow your official service manual and safety precautions. Read our full disclaimer.