Comprehensive insurance is designed for any covered peril that may cause damage to your vehicle, like hitting a deer or vandalism. Collision insurance covers damage to your vehicle when you collide with another vehicle or object. Unless your engine failure is due to one of these situations, you wouldn’t have coverage.
Depending on where you purchased your vehicle from, you may have some type of extended warranty with the dealership. You can always confirm with them to see if it would be covered under any of their policies.
If not, you’ll need to cover the repairs yourself. Depending on the cost, it may be worth looking into either trading in your vehicle or selling it as is.”