My check engine light came on and it blinks once. From all the manuals and advice i get from people and honda techs, it is a bad O2 sensor. I dont know where to even look for to check if its bad or not. SO i need some help on where to look and what to do. thanks

 

Well chances are that if your getting the code you are going to have to get a new one. Check the wire(s) coming out of the o2 sensor and make sure they are plugged in securely.
I am not sure exacly where the sensor is on the 5th gens but it is easy to find. Just follow the exhaust from the block to the cat. It will be the only thing sticking out with wires. 4th Gens are right behind the motor on the A Pipe

 

save yourself the expense and build a 20 dollar Simulator from Radio Shack and forget about the damn thing forever..

Here---> http://mkiv.com/techarticles/o...lator/

Smitty