Pedal Position sensor/Switch
I know this post is a little old, but there were no answers so I thought I would weigh in.
This switch is part of the pedal assembly and you have to purchase the entire assembly not just the switch. The Honda Part # is 17800-SNA-A01 at least for a 2006 1.8L Civic 2 dr coupe.
Look at Majestic Honda for the part or South Bay Honda. They discount their Honda parts by about 30%. The current price for this is $148.97 + Shipping.