I wish you and her the best of luck
your mechanic friends are correct as they said codes will point you in the direction of the problem
lets say its misfiring on cyl # 1 then you know you are dealing with a misfire issue
and not looking for a fuel pump or an o2 sensor issue.
Each code have a list of think that will go with it so you can check.
It makes diagnosing the problem much easier
Wednesday, May 14th, 2008 AT 5:26 PM