how to fix the P0301 misfire code on my Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil bolts and lift the coil out.
• Use a spark plug socket to remove the old spark plug.
• Inspect the spark plug for wear; replace if damaged or excessively worn.
• Apply a small amount of dielectric grease to the new spark plug threads, then install the new spark plug and torque to manufacturer specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil and connect the electrical connector.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• If the spark plug is fine, test the ignition coil by swapping it with another cylinder.
• Start the engine and check for any changes in misfire codes.
• If the misfire moves to the cylinder with the swapped coil, replace the ignition coil for cylinder 1.
• Install the new ignition coil and torque to specifications (typically around 8-12 lb-ft).

4. Clean or Replace Fuel Injector

• Tools Required: Injector cleaning kit or replacement injector, safety goggles, gloves.
• Remove the fuel rail bolts and disconnect the fuel line (ensure to relieve fuel pressure beforehand).
• Remove the fuel injector for cylinder 1.
• Clean the injector using an appropriate cleaning solution or replace if necessary.
• Reinstall the injector with new O-rings, ensuring a proper seal.

5. Verify Compression

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine to get a reading. Compare the reading to manufacturer specifications (usually around 150-200 psi). A low reading may indicate internal engine issues.