i have a 99 civic si and i noticed that my CEL came on , i went to auto zone to get it checked out and two codes came out p0172 and P0133. fuel system is too rich bank 1 on P0172 im not sure if P0133 is the same thing or not , can someone help me on what to do i kno i need a new 02 sensor but what about the other code and if sumone can tell me on how to do it like a site with instructions i herd it isnt that hard to do, and they also printed out the 02 sensors to buy and an air/fuel ratio and they say that theres two 02 sensors but i only have one before the cat , i have 4-1 type R replica headers......

 

First reset the ECU and drive the car to see whether one or both CEL codes repeat. Post any codes that pop up after a reset.

 

how do i reset it ?

 

i believe the CEL came on before i put the headers and exhaust in and i had put a pass jdm intake on and the light didnt come on till like a month after or so....

 

Remove the 7.5A hood Back Up fuse for a few minutes.