A cracked windshield is one of the worst things that could happen to your car when it comes to its visual appearance. However, windshield cracks could cause so much more than just make your car car look worse. For example, you could end up in an accident just because your car's windshield was cracked. So, basically, a cracked windshield can reduce your visibility big time.
Even if it is just a small crack or chip, there is a big chance that it will start spreading all over your windshield if left untreated for a couple of days.
Smog tests are a legal requirement in many states. They are meant to ensure that whatever your car emits is within the limits prescribed by law.
You do not want to fail the smog test as this will cost you time and money. You will have to go through the test again and pay for another test.
Check Engine Light
If this light is on, you may not automatically fail the smog test, depending on your state.