Certified Exhaust System Inspector (CESI) The CESI uniquely bridges emissions technology and hands-on diagnostics—most inspectors struggle because they neglect the correlation between catalytic converter efficiency readings and upstream oxygen sensor faults. This exam demands you trace failure chains across modern systems, not just identify individual components in isolation.
| Exam Name | Certified Exhaust System Inspector |
| Exam Code | CESI |
| Format | PDF & Practice Test Engine |
| Target Year | 2026 Updated |
| Features | 100% Verified Q&As |
