What are the data types for your 4 fields (e.g.StrCarFilter)? If they are numeric, delimiters are not required. If they are text or date, proper delimiters are required. I don't want to propose an alternate example without knowing. If you would like a link on naming things, I can provide one or you can google your own. I ask because typically, I would not prefix with Str for everything. To me, it means it's a string (text) data type. If it's not, a better name would mean you'd never have to guess and neither would we! For example, if it's numeric, then intType, lngType, dblType, sngType, etc. not StrCarType.
Also please use code tags and good indentation to make your code easier to read.
Other tips:
use Me. not Me!.
ensure Option Explicit is at the top of every module
it isn't necessary to include a property for a control reference when that property is the default property. So for textbox, combobox, .Value isn't required.
Another example of this is If Me.chk_driver.Value = True Then
is the same as
If Me.chk_driver Then (as long as you're expecting that If statement to pertain to what to do if True).
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.