I have a 1998 Volvo S70 and sometimes the speedometer and odometer work but most of the time they don't?

850,
S70,
V70,
S80

1996-97,
1998-00,

1999-00

Service reminder lamp must be reset with either a Scan Tool Connected to the Data Link Connector (DLC), or connect a Volvo Rest Tool to the DLC and press the button on the tool to reset.


240

1986-93

When the "SERVICE" is illuminated, reach behind the instrument panel and push the level located between the tachometer and speedometer.


740,780

1986-88,
1988-90

When the "SERVICE" light is illuminated, reach behind the instrument panel and press the button located to the right of the speedometer.


740,
760,
850
w/ Yazaki Cluster*,
940,
960

1989-92,
1986-90,
1991-97

When the "SERVICE" light is illuminated, remove the cap on the face of the instrument panel between the clock and the speedometer. Insert a thin-bladed tool into the cavity and press the reset button.

*Odometer above the speedometer needle.


All Models

1999

Press and hold trip odometer reset button. Next, turn the ignition key to the run position KPII (not the start position). Wait 30 seconds or until service light begins blinking. Turn the ignition to off position. Release the Trip Odometer button.


850
w/ VDO Cluster*

All Years

To reset the Service Reminder Indicator, turn the ignition on while the engine is not running. Access the diagnostic unit located on the left fender well under the hood. Connect the single wire plug to terminal #7. Press the reset button four times shortly. When the LED glows, press the button once. When the LED glows steadily again, press the button five times. When the LED glows steadily again, press the button once. After the LED gives a couple of rapid flashes, the system is reset. Unplug the connector and turn the ignition off.

*Odometer located below the speedometer needle.