My wife's TrailBlazer turned on the Check Engine Light a few days ago. Usually, this means either a dirty air filter (and do we have problems with that where we are) or a loose gas cap. I replaced the air filter (it needed it), but the light stayed on. I was not looking forward to taking it to the dealer, but then I saw that the price for the basic OBD-II readers that plug into the electronics on the car have dropped a good bit. I picked up an Actron OBD-II reader from AutoZone for $59.95. With it, I could see that there was only one code, P1400, which often indicates dirty air filter or input restrictions, cleared the code -- and the light has not come back. This is such a useful product for effectively all 1996 and later cars, because there is so much information available through that interface under the dash!
You can buy the same unit from Amazon for $49.95. Shockingly enough, Made in Mexico, not China.
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