how to fix the P0301 misfire code in my Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery.
• Ensure the engine is cool to avoid burns.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, ratchet.
• Remove the ignition coil from cylinder 1.
• Use a spark plug socket to remove the spark plug.
• Inspect the spark plug for wear or fouling; replace if necessary with a new spark plug of the correct specification (usually NGK or Denso for Toyota).
• Torque the new spark plug to manufacturer specifications (typically around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Ratchet and socket set.
• If the spark plug is in good condition, proceed to inspect the ignition coil.
• Remove the ignition coil from cylinder 1.
• Test the ignition coil with a multimeter to check for proper resistance (refer to specifications for your model).
• If defective, replace it with a new ignition coil and ensure it is seated correctly.

4. Check Fuel Injector

• Tools Required: Fuel injector cleaning kit (if cleaning), replacement fuel injector (if necessary).
• Disconnect the fuel injector connector for cylinder 1.
• Perform a resistance test on the injector to ensure it’s within specifications.
• If clogged, clean the fuel injector using a cleaning kit; if malfunctioning, replace it with a new injector.

5. Verify Compression

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the compression reading and compare it with manufacturer specifications (usually around 180-200 psi for a healthy engine).
• If compression is low, further investigation into the engine health is required (potential valve or head gasket issues).