How to Replace the Key Fob Battery in a Honda Civic Coupe

Steps from the 2020 Honda Civic Coupe owner's manual (Smart entry remote).

Remove the built-in key from the smart entry remote.
Carefully pry off the upper half of the cover at its edge using a coin.
Take care not to lose the buttons when removing the cover.
Swap in the new CR2032 battery, making sure the polarity is correct.

Battery type: CR2032.
Wrap the coin in cloth to prevent scratching the remote.

Source: 2020 Honda Civic Coupe owner's manual, PDF page 593. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.

Confirm with your own manual, dipstick or door-jamb label.
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