Gasoline fuel vapors enter the passenger cabin of my 2026 Honda Odyssey while driving. The problem began XXX, the day after a dealer oil change, and has recurred repeatedly, growing stronger each time. It is worst in high ambient heat (100 to 116 F), with the fuel tank above half full, and after extended idling or stop-and-go driving on a heat-soaked engine. It initially occurred only after idling but now also fills the cabin at cruising speed. No warning lights or messages precede it. On XXX in about 116 F heat, the cabin filled with gasoline vapor with my two children (ages [XXX] and [XXX]) aboard. Onset was immediate: nausea, lightheadedness, and sore throat. I had to shut off the A/C and open the windows in extreme heat to reduce exposure, and the children had to be taken home in a different vehicle. Poison control was contacted the same day, opened case files for all three of us, and assessed the symptoms as consistent with short-term gasoline vapor exposure. A pediatric follow-up is scheduled. The dealer has confirmed the problem. Repair Order XXX (Tempe Honda, XXX 14,032 miles) states the advisor and tech did confirm smell coming from vehicle, and that the issue is currently under investigation by AHM, with no work done. An earlier dealer inspection onXXX found nothing. American Honda has an open corporate case, and no repair path has been provided to date. In-cabin TVOC air readings of about 2.0 mg/m3, peaking at 6.0 mg/m3, were captured on video. The vehicle is av