If your license tag renewal is now due, yes, it must be redone.
the seller is responsible to present the smog test paper while selling the car, the smog test paper is acceptable within the last 90 days.
Probably not as the emissions test (Smog test) is carried out by inserting a sensor into the exhaust pipe.
yes it suppose to circulate the smoke if clogged smog test will fail
when they check your car!
If you visit the site http://www.dmv.org/smog-check.php, you can check which states require a car smog test. Simply click on a state, and it will tell you whether one is required.
I never replace it ,only if you need to like before a smog test so it can pass emissions
No, it will not pass the smog test with a defective or removed O2 sensor.
There are a few states that are required to have smog checks. One of these states that has the most smog in the United States is California and it's necessary as smog is very harmful to the environment.
no its illegal
The dealer has the option to pay for the smog test or to have you pay for it. They are allowed to charge you what it costs them to get it smogged plus $50. If the dealer is paying for the smog test themselves you can expect to have the smogging cost included in the selling price. See reference: http://www.webcarsandtrucks.com/faq.html#who%20pays
the opdomiter does not work, will it pass smog? opdomiter, not sure what that is. Please define.
A faulty EGR valve can cause a 98 Chevy to fail a smog test. The oxygen sensors should also be tested as they can also cause a 98 Chevy to fail a smog test.