how do I fix the engine misfire code P0301 on my Toyota Camry XV50 (2012-2017)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the ignition coil connected to cylinder 1.
• Remove the spark plug using the socket set.
• Inspect the spark plug for signs of wear or damage; replace if necessary.
• Set the gap on the new spark plug to the manufacturer's specification.
• Install the new spark plug and torque it to the manufacturer’s specification (typically around 13 ft-lbs).
• Reattach the ignition coil.

3. Check and Replace Ignition Coil (if necessary)

• Tools Required: Socket set, multimeter (for testing).
• If the spark plug is fine, test the ignition coil with a multimeter to ensure proper resistance.
• If faulty, remove the ignition coil from cylinder 1.
• Install a new ignition coil, ensuring it is seated properly.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, fuel line disconnect tool.
• If the ignition coil is functional, remove the fuel injector for cylinder 1.
• Clean the injector using a specialized fuel injector cleaner.
• Reinstall the fuel injector securely.

5. Test for Compression

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications; replace any components as necessary if compression is low.