Evaporative emissions control system switch/ low ?
 

my 2000 box had 02 sensor problems so got all four replace, did it myself saved the $$. now the only code that pops up on the scanner is the evaporative emissions control system switch... what is that? is it doing damage to my car? and can i diy with this peice or would i have to go to dealership.. please help me out , i want engine light off

What diagnostic code do you see? It would help answer your question.

the code is PO452....

From what I've found, P0452 suggests there is a "short to ground" problem with the fuel pressure sensor. It's beyond my skill level to know if this means the sensor itself is defective or there could be another reason for the fault code such as a low voltage condition.

The part is pricey. I'd wait for a few other folks to comment before ordering it. As I understand it the sensor is located on top of the gas tank. See picture.

http://986forum.com/forums/uploads01...1355183596.jpg

This picture came from the last poster in the following thread: http://www.renntech.org/forums/topic/14454-tank-pressure-sensor-install-p0452-issue/