Ase x1 exhaust systems general questions question 1 of 1 we have several ase practice tests back at the ase practice test main page please check back in the future as we are constantly adding new questions for now go to the ase category page or click submit to see other free ase practice tests that contain hundreds of questions faq. Use our free ase practice tests to pass you exam and get your ase certification study with actual ase questions and answers updated for 2021 the national institute for automotive service excellence ase is a non profit professional certification group that provides professional certification to those in the automobile repair and service industry throughout the united states as well as . Included with our ase x1 study guide for the exhaust systems certification is our free ase x1 practice test ase x1 study guide is published 03 2012. Ase certification tests can be very difficult typically less than 70 of people pass on their first attempt to help you be prepared as much as possible weve created some of the most detailed free practice tests that you can find online again its free with no strings attached. The x1 ase certification test has a section 8 questions focused on emissions system diagnosis for that section ase defines the tasks as o identify failed catalytic converters determine the cause of failure o identify failed oxygen sensors o2s ho2s components and circuitry determine the cause of failure