i appreciate your help akirby and rpreuss but im still left clueless. i know what the code means but what exactly makes it go off? is it bad oil , a loose connection , has anyone had this problem and how was the issue resolved......where is it ,how to remove it or how to fix it ? have had it for a few months now....have changed o2 sensors ,m.a.f sensor and 2 sensors located on top (side) of the the valve covers by the timing belt. ....light still on