My 2000 Si is throwing two codes. Code 61 (Primary O2 Sensor Circuit) and code 90 (Evaporative Emmission Control System Leak Detected). What can I do to try and fix these codes myself rather than taking my car to a shop? Thanks.

 

buy a manual and read up on what that says, always works for me

 

First check your gas cap and make sure its installed correctly (dont laugh) this is the most likely thing if you have an evap code. Now re-set ECU and see if they come back. If the O2 sensor code comes back, replace it.......3gdude