how to fix P0301 misfire code in Toyota Camry XV40 (2007-2011)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Replace Ignition Coil (if faulty)

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the engine cover if necessary.
• Disconnect the connector from the ignition coil for cylinder 1.
• Remove the bolt(s) securing the ignition coil and gently pull it out.
• Apply dielectric grease to the new ignition coil's connector.
• Install the new ignition coil, secure it with the bolt(s), and reconnect the connector.
• Torque specifications: 7.2 ft-lbs (10 Nm).

3. Replace Spark Plug (if worn)

• Tools Required: Spark plug socket, torque wrench.
• Remove the ignition coil to access the spark plug.
• Use a spark plug socket to remove the old spark plug.
• Inspect the spark plug for signs of wear (electrode wear, carbon deposits).
• Install the new spark plug with a gap of 0.043 inches (1.1 mm) if applicable.
• Torque specifications: 13 ft-lbs (18 Nm).

4. Inspect and Replace Fuel Injector (if defective)

• Tools Required: Fuel injector removal tool (if necessary), socket set.
• Disconnect the fuel injector connector and fuel line (ensure to relieve fuel pressure first).
• Remove the retaining clip and pull out the fuel injector.
• Install the new fuel injector and secure it with the retaining clip.
• Reconnect the fuel line and electrical connector.

5. Reassemble and Test

• Reinstall any components that were removed (engine cover, etc.).
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.