Step No. If all goes well, the check engine light should remain OFF for the remainder of your drive. Here are some different ways how you can reset your check engine light. Just because the check engine light (CEL) is not on it doesn't mean there are no codes in your computer memory. These codes can still help you. OBD-I Codes. How to read the codes. In this mode, the computer will display a Code 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. Step No. Locate the test port under the dash where the OBD-ii scanner plugs in. There are a number of reasons that this may be happening. Once the ECM is in Diagnostic Test Mode II, the "Service Engine Soon" warning light will start flashing. Have a Check Engine light on with no code? From mechanical to computer to outdated equipment, there are still plenty of ways to see why the light came on, what the actual issue is, and what needs to be done to fix it. You car's computer may still store pending codes. Go back inside the car and count the number of flashes for the check engine light. 3: Understand the code. It will be lit, and will begin to pulse. This procedure will not work on Toyota vehicles equipped with OBD-II. For instance, Code 23 will go like this: pulse, pulse, pause, pulse, pulse, pulse. Each pulse represents a number. The Best Way to Clear OBD2 Codes (with a scanner) In order to properly clear or erase OBDII codes, it is better to use a scanner. 3 … But if you do not have one available, you can often do it without one. So scan the computer and see if there are any. OBD2 codes cause your check engine light turn on. 1 Normal Condition. The first step to read the codes is setting the ECM in Diagnostic Test Mode II. It’s still recommended to check the trouble codes first with an OBD2 scanner if the check engine light is ON. Watch the “Check Engine” light for the codes to flash. 1. Ground terminals A and B (see diagram below) with the ignition "ON" and engine not running. Using jumper wires to flash codes has been built in by the car manufacturers to ensure people without a Scan Tool or Code Reader can still diagnose the vehicle faults by reading the codes. Take your vehicle to an auto parts dealer for a diagnostic check … Another important thing to take care of while you doing this process is to have a look at your check engine’s dashboard light. The system will enter the diagnostic mode. When you will see the service light or check engine light of your car, it … A pause separates one digit from the next in a two-digit code. The simplest way to reset the check engine light is with an OBD2 scanner. 2 Air Flow Meter signal. These are codes related to potential problems the computer detected once and haven't reappeared. But if the check engine light returns, you have no choice to plug in a scan tool to determine the cause of the fault. 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