i used a paperclip to see what code my car is throwing that was making my check engine light come on. it gave me a code 54 which is ckf sensor (crankshaft speed fluctuation) defective circuit or unplugged/defective sensor. anyone know how to fix this problem, or where this sensor is located. i'd rather try to do it myself than take it to a shop if its possible. thanks in advance for any help you may be able to give me.