How to Replace the Key Fob Battery in a Volvo S90 Twin Engine

1. Hold the key with the Volvo logo side up, move the button on the key ring section to the right, and slide the front cover slightly upward to remove it.
2. Turn the key over, move the button to the side, and slide the rear cover slightly upward to remove it.
3. Use a screwdriver to turn the battery cover counterclockwise until the markers point to OPEN, then pry the cover up.
4. Carefully pry out the old battery, noting that its positive side (+) faces upward.
5. Insert a new battery with the positive side (+) facing upward, sliding it forward until it locks under the plastic catches, then press it down.
6. Replace the battery cover and turn it clockwise to CLOSE, then refit the rear and front covers until they click into place.

• Use batteries with the designation CR2032, 3 V.
• Replace the battery when the message Vehicle key bat. low is displayed or the locks do not react.
• Avoid touching the new battery and its contact surfaces with your fingers.

Source: 2020 Volvo S90 Twin Engine owner's manual, PDF pages 242, 243, 244. 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.