"My car is still being repaired."

Translation: Mobil saya masih diperbaiki.

[donny309620]

Is "Mobil saya masih /sedang/ diperbaiki" acceptable?

[demoksaputra]

I think it is grammatically correct, but I don't think you will hear Indonesian people talk that specifically in daily conversation. We'd either say "mobil saya lagi/sedang diperbaiki," or "mobil saya masih diperbaiki."