For a 2013-17 turn ignition to on position without starting the car and at the same time hold the brake and gas down firmly. Hold it for about 30 seconds and you will see it reset on the display in front of you. When it says the reset is complete, you can let up on the pedals and turn the key off. It should turn off the oil and or engine light. Step 5. Verify that the Check Engine light has gone out on the instrument panel. References. The Check Engine light on your Ford Crown Victoria indicates a problem with your vehicle's emissions control system. The Check Engine light comes on as a result of the Crown Victoria's computer, called an ECU, generating a trouble code. Step 3 – Turn on your car. Turn the ignition to the ON position only, but don't turn over the engine. Wait for a few minutes. Replace the ECU fuse. The CEL should flash, then go out. Figure 3. The CEL should be out when you restart your car. 1. Loose or bad gas cap. It is possible for the check engine light to come on in Compass due to a loose or bad gas cap. The fuel system in modern vehicles is designed to maintain a certain level of pressure, and if the gas cap is not sealing properly, it can cause a leak and disrupt the pressure balance in the system. 11. Exhaust Gas Recirculation Valve Failure. The exhaust gas recirculation (EGR) valve regulates exhaust gases to lower nitrogen oxide emissions, improve engine efficiency, and increase fuel economy. An EGR valve can go bad or just get clogged with carbon buildup over time. 1. Loose or bad gas cap. It is possible for the check engine light to come on in Tacoma due to a loose or bad gas cap. The fuel system in modern vehicles is designed to maintain a certain level of pressure, and if the gas cap is not sealing properly, it can cause a leak and disrupt the pressure balance in the system. Store codes or write them down. Research the codes and what could be causing the problem in your VW. Reconnect the scanner [2] and select Clear Codes to reset the VW engine light. Turn the ignition off and wait for several seconds. Turn the engine on and check to ensure the check engine light is off. Step 1. Assuming you have already located the battery location under the hood, use a wrench to disconnect the negative cable (it’s usually covered by a black cap) from the battery terminal. Step 2. Next, press and hold the horn for approx. 30 seconds or try switching on the vehicle lights. yWklYv.