how to fix the P0302 misfire code in my Toyota Camry XV40 (2007-2011)

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the ignition coil by unscrewing the retaining bolts.
• Disconnect the electrical connector from the ignition coil.
• Remove the spark plug using a socket wrench and spark plug socket.
• Inspect the old spark plug for damage or abnormal wear.
• Install a new spark plug (ensure to check and set the gap according to specifications).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test or Replace Ignition Coil

• If the spark plug replacement does not resolve the issue, test the ignition coil with a multimeter:
  • Measure the resistance of the coil terminals (primary and secondary) according to manufacturer specifications.
• If the coil is faulty, remove it and install a new ignition coil.
• Reconnect all electrical connectors securely.

4. Inspect/Replace Fuel Injector

• Disconnect the fuel injector electrical connector.
• Remove the fuel rail if necessary to access the injector.
• Test the fuel injector by checking its resistance with a multimeter; replace if out of specification.
• Clean or replace the fuel injector as needed.
• Reinstall the fuel rail and reconnect the injector and electrical connectors.

5. Compression Test (if necessary)

• Remove the spark plug from cylinder 2.
• Insert the compression gauge into the spark plug hole.
• Crank the engine for a few seconds while monitoring the gauge.
• Compare the readings against specifications; if low, consider further engine diagnostics or repairs.

Tools Required:

• OBD-II scanner
• Socket set (including spark plug socket)
• Multimeter
• Compression gauge
• Torque wrench
• Screwdrivers

Parts Required:

• Spark plug (specific to engine model)
• Ignition coil (if necessary)
• Fuel injector (if necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical components.
• Allow the engine to cool completely before starting work to avoid burns.