I am trying to find the most economical way in finding the emission leak does anyone have any clue if this is common on 2005 350z and if there's any sensor or hoses I should be checking by default. I took my car to the mechanic and he suggested to leave the car with him, that he was going to insert some type of gas that will pin point the leak. but I was afraid of the bill, since he couldn't tell me how much it would cost me to repair it. anyhow, for now he reset the engine light, but I know I am burning rich and my MPG is about 17..