Hey guys I just ran my car through the smog test and I failed. I can't renew my registration until I get it fixed. My HC (hydrocarbons) limit is 2.0 and I got a 2.367. This means that I have unburned or partially burned fuel. The CO (carbon monoxide) limit is 20.0 and I got a 69.36. This means that I am running too rich. My O2 sensor has been acting up, so I'm wondering if that's what could set it off. Can anyone help me? What are some things I can do to fix my car so it will pass?