If your second generation 2016, 2017, 2018, 2019, 2020 and 2021 Mazda CX-9 with the Skyactiv-G turbocharged 2.5L I4 engine hasn’t been running well recently, you may need to clean or change the mass air flow (MAF) sensor. Check out the DIY tutorial for the procedure (with the compatible replacement part numbers and common symptoms.
2016-2021 Mazda CX-9 MAF Sensor Replacement Guide
