Voyager 2 is still collecting some data and sends it back. Voyager 1 did that until December, at the moment it can’t send measurements back. It’s not the first issue with the probes, they might be able to fix it.
Both are powered by radioactive sources which lose power over time, so NASA had to shut off most sensors. It’s expected that the probes won’t have enough power to communicate with Earth within the next 15 years.
Both are still measuring the magnetic field, properties of the plasma they are flying through, and cosmic rays that hit them. Everything that resembles a camera has been shut off – needs too much power, and there isn’t much to take pictures of anyway. Wikipedia has tables:
https://en.wikipedia.org/wiki/Voyager_2#Scientific_instruments
https://en.wikipedia.org/wiki/Voyager_1#Scientific_instruments
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