guys i'm thinking about taking my car to the Honda Dealership for a complete diagnostics check. I have couple of questions tho. how much do they charge and do they check everything??

 

Call the dealer and ask, Every dealer is different.

What exactly do you want done?
Do you have a problem with the car?
Is a warning light on?
Do you need to have some service work done?

That's what the dealer is going to ask.