My '05 Odyssey EX has developed what my wife and I would describe as a warm plastic odor after driving it for 10-15 minutes. After turning the engine off, the smell goes away. If I just let the Odyssey sit and idle (not drive it), the smell doesn't seem to develop. When I try to trace the smell, it seems to be coming from the engine compartment on the driver's side (around the battery/air filter area). If anyone has any suggestions of what to check, I'd greatly appreciate it. At this point, it is the only symptom the van has....a smell.