how to diagnose P0302 misfire code on my Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal.
• Allow the engine to cool before starting.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench, dielectric grease.
• Remove the ignition coil for cylinder 2 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for wear and compare with specifications.
• Install the new spark plug, applying dielectric grease to the boot of the ignition coil.
• Torque the spark plug to the manufacturer's specification (typically around 13 lb-ft).

3. Test or Replace Ignition Coil

• Tools Required: Multimeter (if testing), socket set.
• If the ignition coil was swapped earlier, reinstall the original coil in cylinder 2.
• If replacing, install the new ignition coil by securing it in place and reconnecting the electrical connector.

4. Inspect or Replace Fuel Injector

• Tools Required: Fuel injector removal tool, socket set.
• Remove the fuel rail (if necessary) to access the fuel injector for cylinder 2.
• Inspect the injector for clogs or leaks. Clean or replace as needed.
• Reinstall the fuel rail and ensure all connections are secure.

5. Final Assembly

• Reinstall the ignition coil and reconnect the battery terminal.
• Start the engine and check for any misfire codes.