Explains MAF sensor diagnostic & operation. Modern MAF sensors employ a hot Platinum wire with specific circuitry to measure its current as it cools down due to incoming air. Learn how these components work. They're found in every vehicle today. Understand its operation and how to test it here. (note: We allow all schools and training institutions to use our software free of charge, so long as it is not sold to others. You're encouraged to download our free automotive simulation software for more information.