Sevice engine light
In Aug. I bought a 2002 Trailblazer w/ 128,000 mi. It's been running great!
But I live in MI and the snow has started. And when I have to drive in AWD
or 4WD hi, the "service engine soon" light comes on. There's no change in
how it handles. Just the light. I've already put 10,000 mi on it and haven't
had any problems or other service lights come on. How concerned should I
be? (Can do any expensive repairs until tax refund comes in.)