Q: How do you remove and install the air filter housing on Nissan Altima?A: Separate the air filter box halves and detach the front half of the box from the air inlet duct. Disconnect the air duct that connects to the throttle body. On four-cylinder models, disconnect the transmission breather hose. Detach the Mass Air Flow (MAF) sensor connector and dislodge the harness retainer from the box. The mass airflow sensor wiring is secured to the air filter box, typical box mounting bolt. Remove the air filter box mounting bolts, then remove the box. Installation is the reverse of removal.