Are you asking how to clear the check engine light?
Buy a cheap code reader ( $20 ) plug it in the OBD2 port which has to be no more than 3 feet from the steering column and clear the code(s).
If the check engine light comes right back on after you have cleared the code(s),read the code(s) and correct the problem(s).
SOURCE: 2003 Buick Century Custom and the Service Engine Soon Light
You will need to have a reputable mechanic do a diagnostic check on the car to determine the problem. This should pull up a code number in your car's computer and help point the mechanic and you in the direction of the malfunctioning part/s.
Just today, I had a diagnostic check done on mine for nearly $45.00. The mechanic was able to figure out the reason why my service engine light was staying on. I knew my car's radiator fans failed to run when car's engine was hot except when the A/C was running. I had changed out the sensors and was never able to get the light to go out or get the fans working. They were able to determine that the 25 amp fuse for the fans located under the hood was blown. After replacing it, the fans worked as they should, my car runs cooler and the engine service engine light is now out. Of course there are many possible reasons why the service engine light may come on including problems with the car's emissions. A reputable mechanic can solve your problem.
SOURCE: Check engine light on. Code P0440.
wow thermostat >>>> shucks i believe its evep emissions code like faulty gas cap ....you can reset any computer the chck eng light will come on in 50 to 100 miles if not fixed....
SOURCE: 2003 Buick Regal Service Engine Soon light.
The error that I'm showing for error code P1133 is
P1133 Heated Oxygen Sensor (HO2S) insufficient switching bank 1 sensor 1(Rear Bank). I would suggest having both of your Oxygen Sensors replaced if you haven't already had that done. Hope this helps. Thanks for an honest rating and for using FixYa.
SOURCE: 2004 Saturn VUE (M/T) STEADY service engine soon light
SOME TIME PCM GET A VOLTAGE SPIKE.OR ELECTRICAL INTERFERENCE WILL CAUSE SERVICE LIGHT TO COME ON WITH NO CODES.IF IT KEEP HAPPENING TAKE IT TO DEALERSHIP TO CHECK IT OUT.
SOURCE: how to clear code service engine soon 2002
you need to use an OBDII scan tool that will read any "error" codes and give you the system that will be causing the check engine light to come on. this tool will also allow you to erase the code after you have read it. write the code down as you may have to pinpoint exactly what part may have failed and needs replacing. something as simple as a loose gas cap will cause the check engine light to come on. it could be any of a dozen different emission or ignition sensors that may be bad depending on the error code. all 1996 and newer vehicles sold in the US will have the OBDII system and standard diagnostic/data link connector,which is usually under the driver side of the dash, to plug the scan tool into to read the DTC's(diagnostic trouble codes).
Please see my tip at http://www.fixya.com/cars/r5932051-check_engine_light_check. These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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