How can you buy a vehicle sticker in Illinois without an emissions test?

You can't buy an Illinois vehicle sticker without passing an emissions test if your vehicle is required to undergo one. Illinois requires emissions testing in certain counties, and if your county is included, a passing emissions test is a prerequisite for obtaining your vehicle registration sticker. There are no exceptions unless your vehicle is specifically exempt (e.g., very old vehicles, certain types of vehicles). Attempting to obtain a sticker without a required emissions test will result in your registration application being denied.