How come the C.E.S. lits every now and then and then stops, and then lits again. I have a chevy blazer 96 if that helps. My friend calls it the stupid light, but does it mean there is something wrong with the car if it does lit or what, yeah we‘ve taken it to the shop couple of times but the sign lits up still every now and then. :( what could be wrong? thank you very much.
something is not right if the light is on. if the light is on take it to an autozone near you and they will scan it for free. make sure that the light is on and don't turn the car off and have them come out and scan it while it is running. chances are it is probably an oxygen sensor causing the light to go off and on. why the hell would you have to take the vehicle to the chevy dealer ? some people who answer questions here are a bunch of retards. the vehicle is an obd2 system which you don't have to be a chevy specialist to read the codes. DAMM! i think coop is right but why stop with the wires and coil ? maybe the computer is defective and the ignition switch is faulty and the crank sensor is toast and the pick-up coil in the distributor has an intermittent short but i think rather than recommending replacing any part or parts that finding out what is actually causing the light to come on in the first place would be a much more prudent idea.
The Check Engine Soon light comes on when the on-board engine controller senses a problem with the engine or transmission, that will cause the vehicles' emission levels to reach 1and1/2 times the federal limit. Simply put, the engine controller senses a fault in one (or more) of the systems it controls. There are literally dozens of items that can cause the light to come on, such as a loose gas cap, weak Oxygen sensor, engine misfire, and so on. You need to have the computer scanned for fault code(s), and repair as necessary. As has been mentioned, Auto Zone will scan the vehicle for free, and give you an idea of what part of the computer system the problem is in. Or, take the vehicle to a trusted auto repair shop and have it scanned and repaired. If it is something like a bad Oxygen sensor, it could cause the engine to run rich and melt the catalytic converter, which can run into a lot of money. My advice is as I stated above, take the vehicle to a trusted shop, have them scan the computer and give you an estimate for repair. HTH!! Good Luck!!
It could indicate that it's time for a tune-up, oxygen sensor or a short in the wiring for the light. I would suggest taking it to a Chevy dealer or someone who specializes in Chevy's. That way, with a dealer, it will be fixed correctly with a guarantee on the work.
