ok well my cel has been on for a while and i jus found out that it is code p0234 (over boost)and a p2096 (down stream fule system 1/2 lean i think thats waht it is) and my question is first of all is it bad for the car and my second question is what am i suppose to do do i just go to auto zone and just get it cleared or what am i suppose to do some one please hlep