Alright I got car inspection coming up in a week and I am a little worried. On my way home from work I got a P0420 and I rarely get this CEL. I'm just wondering if this would screw up on the emissions test even though It rarely pops up....also what is the cost and labor to get the part replaced? Now I bought the car from California and it failed the smog test. Is the smog test the same as emissions test? (I'm assuming yes.)