Service Engine Soon light
I have 11,000 miles on my 2003 Trailblazer. Two weeks ago, it just stalled while accelerating. I rolled off the road and started it up - no problem. But the Service Engine Soon light came on. I arrived at work and read the manual. I shut off the car for awhile and restarted - no light. The next day, it came on while driving, and would not reset. I understand this light indicates an emissions issue. I checked the gas cap. The dealer found a code for an emissions problem, but could not cause it to re-occur. He suggested changing the fuel filter. He did and he said it showed "some" blockage (even he didn't sound convinced). I have read posts which suggest this light shows a computer problem, not an emissions issue.. can someone give me a categorical answer as to the type of problem this indicator relates to?
By the way, it's been fine since the filter was changed, so that might have been it.
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