Agreed not all codes can be cleared this way. You need a scan tool to clear all. If you are lucky you can find one at Kragen or somewhere similar for $25 bucks and up. Same with JcWhittney- 24.95-399.99. I think it would be cheaper in the long run for ya to get a 60 buck scanner because you can use it again and again instead of payin a shop 100 bucks a shot.