How to Replace the Key Fob Battery in a Volvo S90

Steps from the 2018 Volvo S90 owner's manual (remote key (not the Key Tag, whose battery cannot be replaced)).

Hold the remote key with the front side (Volvo logo) facing up and move the button on the key ring section to the right.
Slide the front cover slightly upward so it loosens, then remove it from the key.
Turn the key over and move the button to the side.
Slide the rear cover slightly upward so it loosens, then remove it from the key.

Replace the battery when the message Vehicle key bat. low See Owner's manual appears or the locks do not react.
The pages shown end after removing the covers and do not describe the battery swap itself or its type.

Source: 2018 Volvo S90 owner's manual, PDF pages 236, 237. 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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