change air filter first.
I saw some product you can buy from a store(Wal-mart, canadian tire etc) which claims that it can help you to pass emission. Put it into a full gas tank and drive until the tank is almost empty.Then fill up,drive the car until fully warm-up, go to take emission test. Good luck!
I saw some product you can buy from a store(Wal-mart, canadian tire etc) which claims that it can help you to pass emission. Put it into a full gas tank and drive until the tank is almost empty.Then fill up,drive the car until fully warm-up, go to take emission test. Good luck!