Autel MS309's Universal Code Reader & Emission Check: 2023 Tested Showdown We tested the Autel MS309 OBD2 scanner across a range of 2023 vehicles, and it's clear this tool is a reliable workhorse. Its universal compatibility makes it a standout for modern cars, offering seamless access to engine fault codes, emission monitor status, and even CAN-bus diagnostics. The user-friendly interface, with a bright LED screen and multilingual support, simplifies navigation for drivers of all tech levels. While it excels in basic diagnostics, we noticed some limitations in advanced features compared to pricier competitors. Still, its affordability and straightforward performance make it an excellent choice for budget-conscious users seeking clear, actionable data. Whether you're troubleshooting a check engine light or monitoring emissions compliance, the MS309 delivers consistent results-though we'd recommend pairing it with a manual for deeper insights. A solid pick for simplicity and reliability in 2023.