Question

The car engine............. working, so i had to fix it. HELP ME AJUDEMM PLIS​

Answer 1

The car engine wasn't working, so I had to fix it.

Wasn't (ou was not) é "Não estava". "Was" é o passado de "is"

Answer 2

The car engine ............. working, so i had to fix it.

O motor do carro .......... funcionando, então eu tive que consertá-lo.

O que pode encaixar melhor aí é "não estava", ficando:

The car engine was not working, so i had to fix it.

• Was é o passado do verto to be, na terceira pessoa do singular (he/she/it) e "car engine" é equivalente a "it".

• Was not pode ser contraído para wasn't.