Not the check engine light but the service light on the 1998 s60 Volvo?

Volvo 1999-2000 - S / V / C70 Models

* Press and Hold odometer reset button

* Turn ignition switch to "run" position

* After SRL flashes, release odometer reset button

* Turn ignition off

* Turn ignition back on to confirm reset

Volvo 1998 - S80 Models

* Turn ignition switch to position 1

* Press and hold the odometer reset button

* Turn ignition switch to position 2

* Wait until service light blinks and then release odometer button

Volvo 1999-2000 - S80 Models

* Turn ignition switch to position 1

* Press and hold "day counter reset button"

* Turn ignition switch to position 2

* Continue holding day counter for approx. 10 seconds

* After SRL flashes, release day counter button

* Should hear "beep-beep" to confirm command accepted

Volvo 2001 - XC 70 Models

* The following steps must be completed with no longer than 5 seconds between each step:

* Make sure the trip meter is in T-1

* Turn ignition key to position 1

* Press and hold trip meter button until zero is shown

* While still holding the trip meter, turn key to position 2

* When original trip mileage returns, release the trip reset button

* Turn key to off