had a problem with my van wanting to start changed the plugs,oil,fuel pump,fuel filter.its got spark and geting gas it starts when it wants to after i changed everthing it started for like 3 days in a row when i seen the service light was on i tried to plug in my scanner and when i did it wouldnt power up so i think there somthing wrong with the plug for the obd2.could there be a problem with the computer? i know my scanner works cause i just used it on my burban.ill take any advice