How to Turn Off a Check Engine Light on Vehicles

by Contributing Writer

Vehicles cars have become more technologically advanced in recent years. ECU (Engine Control Unit) computers are now an integral part of Vehicles car design. The ECU constantly monitors and governs many functions, including the electrical and safety systems of the car, and engine management. When this unit detects a problem, the SES (Service Engine Soon) light on the dashboard turns on to indicate that there's an issue that needs attention. When you take your car in Vehicles repair, mechanics can then read codes from the ECU to determine what specific problems exist. After repairs are complete, the SES light must be reset. The SES light in a Vehicles is frequently called a check-engine light in other makes.

Under The Hood:

 How to Turn Off a Check Engine Light on a Nissan

Open the driver's side door and get into the drivers seat.

Insert the key into the ignition and turn it a quarter turn so the ignition turns on, but the engine doesn't start.

Step on the gas pedal and quickly release it. Do this 5 times in less than 5 seconds. When you step on the pedal, press it down as far as it can go.

Wait 10 seconds.

Press the gas pedal completely down with your foot and hold it there for 10 seconds, or until the SES light blinks on and off.

Step on the gas pedal and hold it down completely for another 10 seconds and then release it.

Turn the ignition key to the off position.

Wait 3 minutes for the ECU to automatically reset.

Start your engine. This will reset the SES light.

 How to Turn Off the Check Engine Light in a Range Rover

Pry off the fuse panel cover under the Range Rover's steering column using your fingers.

Plug the OBD scan tool into the Range Rover's access plug under the dashboard to the left of the fuse panel. This is the onboard diagnostic access port.

Turn on the OBD scan tool and turn the Range Rover's ignition to the "II" position.

Press "clear" on the OBD scan tool to clear the engine codes, and turn off the Range Rover's Check Engine light.

Unplug the scan tool and turn off the ignition.

Items you will need

  • OBD scan tool

 How to Turn Off the Check Engine Light in a Jetta

Open the fuse panel cover on the Jetta by pulling down on the fuse cover with your hands.

Locate the fuse for the EMC (electronic control module), using the fuse diagram on the underside of the fuse cover.

Pull the fuse out of the fuse box, using the fuse pullers in the fuse box.

Wait five minutes, and replace the fuse.

Start the Jetta and confirm that the ECM has been reset and that the "Check Engine" light has shut off.

 How to Turn off the Check Engine Light on a Ford Truck

Turn the ignition key in your Ford to the "On" position, without cranking the engine. Connect the scan tool to the diagnostic port located below the steering column.

Scan the system to determine the code causing your check engine light to illuminate. Write down the code(s) and use the scan tool manual to look it up. If your scan tool does not have a manual, see the resources for a database of OBD-II codes.

Fix the problem with the vehicle yourself or let a certified mechanic fix it.

Use the scan tool to clear the code(s) from your Ford's computer or wait for them to clear on their own. Once the problem is fixed, you can expect an engine light to disappear after 15 to 20 minutes of driving.

Items you will need

  • OBD-II Code Scanner

 How to Turn Off a Check Engine Light in a Toyota Camry

Open the fuse panel under the steering column in the driver's side footwell by pulling down on the fuse-panel cover with your fingers.

Plug the OBD (onboard diagnostic) scan tool plug into the open access port to the left of the main fuse panel. The access port is rectangular in shape and will accept the OBD plug.

Turn on the ignition (but don't start the engine) and power up the OBD scan tool.

Wait for the OBD scan tool display to read "OK." This indicates that the tool has retrieved the engine fault codes. Then, press the "Clear" button on the front of your scan tool. This will clear all engine fault codes and turn off your check-engine light.

Items you will need

  • OBD scan tool

 How to Turn the Check Engine Light off on a 2003 Toyota

Park the vehicle on a level surface and set the parking brake.

Disconnect the ground (black) cable from the negative battery terminal by loosening the retaining bolt and sliding the ground cable off the negative battery post.

Wait at least 10 minutes.

Reconnect the ground cable to the negative battery terminal.

Items you will need

  • Adjustable wrench

 How to Turn Off the Check Engine Light on Mazdas

Open the hood of your Mazda and loosen the nut on the cable clamp using a socket wrench and a 10 millimeter socket. The cable clamp is connected to the negative battery terminal. On the Mazda Miata, the battery is located in the trunk. For these cars, open the trunk, unscrew the plastic retaining nut and pull back the battery cover on the passenger side of the trunk. Then, loosen the nut on the negative battery cable clamp. It's a tight fit with a socket wrench, but it can be done.

Regardless of which Mazda you have, the battery terminals are located on the top of the battery. The cable clamps are extremely obvious and look like small round clamps that wrap around the battery terminal. The retaining nut you'll need to loosen is on the side of the cable clamp. The negative battery terminal is the terminal that does not have a red plastic cover over it.

Slide the negative battery cable clamp off of the negative battery terminal and wait five minutes.

Reconnect the battery cable clamp and tighten the retaining nut you loosened in step 1 using a socket wrench and a 10 millimeter socket. If you are working on a Miata, replace the battery cover and secure the plastic retaining nut.

Turn the ignition to the "on" position and verify that the "check engine" light is now off.

Items you will need

  • Socket wrench

  • 10 mm socket

  • Safety gear