Disconnect the battery for several minutes. But if you don't fix the PROBLEM that caused it to go on in the first place, it will just come back on.
The firewall is the sheetmetal that is between the passenger compartment and the engine bay. So it is located behind the engine, and behind the dash board.
Engine cylinder ( # 2 ) misfire has been detected
California Air Resources Board
On-Board Diagnostics
The Check Engine light indicates a problem with the emissions system. Even though the engine may seem to be running OK, you need to have this looked at by a tech. Damage to the converter or other parts may occur if it is not repaired.
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Yes, this indicates a problem with the emissions system. Have the ECU scanned with an OBD scan tool to retrieve the code that has been set. This code will tell you what part is being effected but not necessarily the bad part.
check your fuses
under the dash board on the drives side mounted in the firewall
Is it an Automatic? If so the computer is telling you that the engine does not have enough revs for the gear selected. Without you engaging "kickdown" the engine management will change down automatically and that's when the warning light displays.
The most common problem on "Engine light" on the dash board means it's time to change your O2 sensor. the "check engine" light is an indication that there is a problem with the computer controlled and or monitored emissions systems. oxygen sensors are just one thing that could be wrong when the light goes on. a tester is connected which tells the technician where the problem is.