exhaust problem
 

i hooked up a computer to my car to see why the service engine soon light was on. it will only come on when the car isnt runnin but in "on" position. when i hooked it up no codes were shown but i looked through the computer and saw that pretty much everything dealing with the exhaust system are messed up. all the way from EVAP to O2 sensor. any one who had this problem?

Um I thought the SES light was supposed to be on if the key was in the "on" position and the engine was off. Mine is like this.

Is the SES light on when driving?

With key "ON" but not running the SES is always on, it's like that in every OBDII car from 1996 to 2010

it will come on every now and then while driving. so will low coolant light