So the car is supposed to be in an Earth-Mars orbit. It it stable or is it designed to fall to earth at some point soon (say one or two orbits)?
Mission continues on an experimental long coast and third stage two burn to target a precessing Earth-Mars elliptical orbit around the sun
… which I can't completely decode.
Update: SpaceX says "Upper stage restart nominal, apogee raised to 7000 km. Will spend 5 hours getting zapped in Van Allen belts & then attempt final burn for Mars."
The closest point to the sun will be about 1AU (Earth-Sun distance). The furthest point from the sun will be something like 1.5AU (Mars-Sun distance).
This orbit will precess, meaning that it will slowly rotate its axis around the sun, rather than staying locked into the exact same path.
TL;DR: Elliptical solar orbit.