Disconnect the negative battery cable for a minute or two is the least expensive way. You can also use a code reader plugged into the data link connector under the steering wheel to clear the codes. If the problem isn't fixed, the light will come back on. Even if the light is off and the problem isn't fixed, the car might not pass an emissions test.
how do I reset my service engine light on my 1999 ford f150
A combination of pulling and pushing the 2 speedo buttons at the same time. This should reset the service light.
A mechanic can reset the service engine soon light on a 1999 Mustang GT. If the light continues to stay on after visiting a mechanic unplugging the battery for a few minutes may get it to stay off.
With an OBD2 scanner.
Have vehicle scanned to determine the problem
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To reset the service light on a 1999 Volkswagen Polo, turn the ignition key to the "on" position without starting the engine. Press the gas pedal three times within five seconds. After this, turn the ignition off and then start the engine to confirm that the service light has been reset. If the light remains on, you may need to repeat the process.
Try going to autozone they check the engine light signals for free and have reset mine
You can take the car to any nearby Autozone and have them reset it for you (for free). But eventually you have to figure out what is turning on the light and fix it!
you will need a scan tool to determine the cause and to reset
turn off engine, and start again
disconnect the battery for 30 seconds