I have a problem with a code p0722 in a 1999 volvo s 70

Year of vehicle may help you get an answer as there were many radio changes. Mine has BlueTooth and many don't etc etc etc.
Why not pop into your Volvo Dealership for help.

code p1671 refers to camshaft position actuator---range /performance problem===causes--wiring ---camshaft position actuator(sensor)
replace the actuator.

If you try to start your car on very low battery voltage it happen that the car forgets immobilizer codes (key is no longer programmed to the car). If that happened, you need to contact Volvo dealer to program the key back to the car.

2000 Volvo S 70 with code po220, this code is for the TPS1. you will need to have the throttle position sensor (TPS) tested , a scan tool will be very helpful with this, i would have a shop look at it and test it,

You may need to have it replaced or adjusted if adjusting can be done, sometimes the tps is non-adjustable , the wiring will also need to be checked and tested, good day.

Check your regulator in the engine bay. Good?

only dealer can you code they need radio serial number on radio because evry car has their own code no one has same

Check the thermostat in the air inlet to the air-filter.
(Replace it is probably what you need to do.)

it is on the outside of the transmission case

You'll have to go back to the dealer and they'll input the code for you.

you can pull up the service recomendations at the Volvo website:

http://www.volvocars.com/us/tools/OwnersInfo/Pages/VolvoOwners.aspx


Register at the site and click YOUR VOLVO then go down and click SEARCH THE OWNERS LIBRARY that will give you an online owners manual and service schedule

hope this helps