How To Replace A Toyota Ignition Coil

Ignition coils power the spark that starts your car and keeps it running. Therefore, they play an important role in your Toyota's ignition system, starting a chain reaction that leads to the combustion of the fuel-air mixture in your engine. Over time, these coils eventually wear out, leading to poor engine performance (among other issues), and need to be replaced.

Fortunately, replacing ignition coils is a fairly straightforward repair you can do at home with a few tools. In this guide, we'll show you what you need to replace an ignition coil in your Toyota car, truck, or SUV.

Tools Needed To Replace An Ignition Coil

Before replacing your Toyota's ignition coils, you'll want to gather the following tools:

1. Pliers
2. Flat head screwdriver
3. Socket set
4. Dielectric grease
5. Safety gloves and glasses

Preparing Your Vehicle

Like any home auto repair, it's important to park in a safe area like a garage or a level driveway. Then open the hood and disconnect your Toyota's battery. In addition to disconnecting the battery, here are some important safety tips to follow:

1. Wear safety gear, including neoprene or mechanic's gloves and safety goggles.
2. Work in a well-lit, well-ventilated area.
3. When in doubt, refer to your Toyota's manual for specific guidelines and procedures.

The ignition coils are located on top of your vehicle's spark plugs. Depending on what engine you have, you may find them inserted through the valve cover. If you have trouble finding them, consult your vehicle's service manual to identify their location.

Steps To Replace The Ignition Coils

1. Access the Ignition Coil: Use the appropriate tools to remove any components blocking access to the ignition coils. These obstacles may include engine covers, air intakes or plenums, electrical wiring, or hoses.
2. Disconnect the Battery
3. Disconnect Electrical Connections: Carefully disconnect the ignition coil's electrical connectors and mark their locations for reassembly later. Depending on the model of your Toyota vehicle, these connectors may pull off or have a clip to hold them in place.
4. Remove Mounting Bolts: Use a socket wrench to remove the mounting bolts securing the ignition coil in place. Keep track of these bolts for reassembly.
5. Detach Old Ignition Coil: Gently pull the old ignition coil away from the spark plug. Be cautious not to damage any surrounding components.
6. Apply Dielectric Grease: Before installing the new ignition coil, apply a thin layer of dielectric grease to the spark plug boot and connector to enhance conductivity and protect against moisture.
7. Install the New Ignition Coil: Position the new ignition coil in place and secure it with the mounting bolts. Reconnect the electrical connectors, ensuring they are firmly in place.
8. Reconnect the Battery: Reattach the negative terminal of the car battery and tighten it securely.
9. Clear any Error Codes: Use an OBD-II scanner to clear any engine misfire codes after you reconnect the battery but before you test the ignition system.
10. Test the Ignition System: Start your Toyota and listen for any unusual sounds. Ensure that the engine runs smoothly without any misfires. If there are misfires or the check engine light illuminates, use your OBD-II scanner to determine the cause and check the coil's connections before trying again.

Genuine OEM Ignition Coils From Olathe Toyota Parts Center

If you need ignition system parts like ignition coils for your Toyota car, truck, or SUV, your best source is the Olathe Toyota Parts Center.  All we carry are OEM parts, available at wholesale prices and backed by the standard Toyota 12-month, unlimited-mile warranty.

We also have a number of free resources that can help you diagnose common Toyota trouble codes and a Toyota VIN decoder to provide info about your vehicle.

Got questions? You can contact us here, and our friendly staff will be glad to help.