Volvo 2008 V70 Owner's Manual page 206

If your Check Engine (MIL) light is lit - or was lit but went out without service, have your vehicle diagnosed and, if
necessary, serviced by a qualified Volvo technician.
If you recently had service for a lit Check Engine light, or if you had service that required disconnecting the battery,
a period of driving is necessary to bring the OBD II system to "ready" for inspection. A half-hour trip of mixed stop-
and-go/highway driving is typically needed to allow OBD II to reach readiness. Your Volvo retailer can provide you
with more information on planning a trip.
Maintain your vehicle in accordance with your vehicle's maintenance schedule.
223
06 Maintenance and specifications
Hood and engine compartment
Opening and closing the hood
Pull the lever located under the left side of the dash to release the hood lock.
Lift the hood slightly. Press the release control (located under the right front edge of the hood) to the left, and lift
the hood
WARNING
Check that the hood locks properly when closed.
Engine compartment, overview