Does a mechanic need to reset the "Check Engine" light on a 2004 Buick LeSabre first, to see if replacement of a GAS CAP fixes a "Loose Gas Cap" error message?
I had a "Loose Gas Cap" message on my 2004 Buick LeSabre that caused
the "CHECK ENGINE" light to come on. I replaced the gas cap and have
driven the car for over a 100 miles in all types of traffic. I was told by
AUTOZONE that this is necessary for the emissions control system to see
that there is no longer a vapor leak, and if the problem has gone away, it
should extinguish the "CHECK ENGINE: light.
The light has not gone out yet.
Is it possible that a mechanic needs to RESET the Check Engine light
FIRST? For all I know I will then need to drive another 100 miles and see
if the light comes back on, to see if the new gas cap fixed the problem? If I
do this, how many miles would the car need to be driven to be certain the
problem is fixed? Incidentally AUTOZONE said they are not allowed to
reset Engine Lights; only mechanics can do that.
