Test 5
WARNING: This page does not describe the selected car, but rather 234 other vehicles, including the 2018 Mazda 6, 2017 Mazda CX-9, 2014 Mazda MX-5 Miata, 2014 Mazda 6, and 2014 Mazda 5. However, it is still accessible from the selected car via links, so may be relevant.
For EGR function testing, see appropriate ENGINE PERFORMANCE section.