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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool completely before starting repairs.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Use a ratchet and socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear; replace if necessary.
• Apply anti-seize lubricant on the threads of the new spark plug.
• Torque the spark plug to the manufacturer's specifications (usually around 13-15 lb-ft).
• Reinstall the ignition coil over the spark plug.

3. Test and Replace Ignition Coil

• Disconnect the wiring harness from the ignition coil in cylinder 1.
• Remove the ignition coil using a ratchet and socket.
• Test the ignition coil with a multimeter to ensure it is within specifications (typically 0.4 to 0.6 ohms for primary resistance).
• If defective, replace the ignition coil with a new one.
• Reconnect the wiring harness.

4. Inspect and Replace Fuel Injector

• Disconnect the electrical connector from the fuel injector in cylinder 1.
• Remove the fuel rail if necessary to access the injector.
• Use a fuel injector cleaning kit or replace the injector if it is clogged or malfunctioning.
• Reinstall the fuel rail and reconnect all wiring.

5. Compression Test

• Remove all spark plugs to facilitate the compression test.
• Insert a compression gauge into the spark plug hole for cylinder 1.
• Crank the engine and record the reading.
• Compare the compression reading to the manufacturer's specifications (usually 150-200 psi).
• If compression is low, further investigation is required for possible internal engine issues.