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There are several methods (each resulting in temporarily "disabling" the Diagnostic Trouble Code, known as DTC). Usually, you can disconnect the battery NEG terminal for several minutes (to be sure). You might succeed in resetting the computer by cycling the ignition switch (on, off, on, off, on, off), each time waiting for 3-5 seconds in each position. There are a variety of methods (depending on make, model, year) which may, or may not, be successful. What many "mechanics" do not know is what series of electronic events take place when they connect a diagnostic tool to any given vehicle. When said mechanic chooses to "erase" (using a scan tool) the DTC from memory, they are only turning the light off, and not fixing the problem. Once a DTC has been set, that code remains until said problem is remedied. Oftentimes, a "Service Engine Soon" lamp will illuminate when a vehicle is in need of routine maintenance, a "hiccup" due to bad gas, a leaking vac. line, etc. "Check Engine" lamps require more serious attention. There are many varied techniques for PROPERLY resetting the PCM/ECM parameters (back to factory specs). Many require a series of start/stop driving conditions, such as: accelerating from 0-60 and maintaining speed for 5 miles, decreasing speed to 40MPH... and maintaining said speed for 2 miles, stopping car to idle for 1 min, Etc. You might try a "quick flash" by disconnecting both cables from the battery. Then, clamp both NEG and POS cables together...making sure that you do not allow this connection to make contact with the battery ( or any other positive power source). Allow this connection to rest for about 10 minutes. Keep in mind that computers are very sensitive, and are subject to damage... by even the slightest of power surges...or inadvertent contact with a power source. Automobile computers ground POSITIVE, not NEGATIVE. So, what you are doing when you connect the two cables together is drawing down any unwanted energy which might be stored in the computer/ICM/ECM/PCM... Reconnect the cables to the battery (after 10 min.). Then, to be certain that the previous codes are not "ghosting", drive the car for a minimum of 20 miles (preferably 60). If the codes were properly (and permanently) removed, the DTC lamp will not light again. Good luck.
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