my costs for issue under warranty?

Yesterday my hybrid system stopped working and I was told to get it into service. Toyota quoted me a hefty diagnostic fee when I dropped off the car, but what else could I do but sign to proceed. After having it through the day they tell me it's the IPM and covered under warranty (Yea!!) though it will take a couple days for parts to arrive.

Questions:
Are all costs, including diagnostics, covered by Toyota?
Will Toyota cover rental car? They said no when I asked for a loaner.

I'm a greenhorn around this largely because my prior 07 Prius never had such issues and never had a relationship with the dealer.

 

I was told parts may not arrive till next week and just found this link indicating toyota should provide a loaner
If my vehicle requires a warranty repair, will Toyota provide me with a loaner vehicle?

Thanks for your response above.

 

@Pulse07
The service advisor told me i should not drive it until it's fixed, so I'll put it on them. I've emailed the service manager about a loaner since they need 5 days for the part to arrive.

@PriusCamper
Diagnostics was quoted about $175 if I recall. The only issue I presented was for the hybrid battery inverter code, which I believe turned out to be this IPM problem. The guy told me the repair was covered, so I'll assume it includes diagnostics and be a squeaky wheel if they try stick me with a bill. I didn't ask them to diagnose any other issues.

 

Update: Service Advisor called this AM to confirm I could use a free loaner (which he didn't offer day prior).
It pays to research your rights and be a squeaky wheel sometimes .