the car is a 99 accord I4 auto.... he just bought it used and the maintainence light lit up... mechanic told him that the fuel emission filter needs to be changed... i was confused cos i never heard of it...

anyways, my friend called the mechanic again and the guy said that the fuel emission filter is "a vent shut valve used to recycle back into the intake manifold "...those r the exact words used by the mechanic... i was WTF?? the only thing i can think of is the sensors in the intake manifold... wat do u guys think?