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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug socket, ratchet, and extension.
• Remove the engine cover (if applicable) by unscrewing any bolts or fasteners holding it in place.
• Disconnect the ignition coil connector from the ignition coil in cylinder 1.
• Remove the ignition coil by unscrewing the bolts or clips securing it.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Install the new spark plug into cylinder 1, ensuring it is properly gapped according to manufacturer specifications (typically around 0.043 inches).
• Reinstall the ignition coil and secure it with bolts. Reconnect the ignition coil connector.
• Replace the engine cover if it was removed.

3. Test and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector puller tool, cleaning solvent (if cleaning), or a replacement fuel injector.
• With the ignition turned off, relieve the fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
• Disconnect the fuel injector connector from the injector in cylinder 1.
• Remove the fuel rail (if necessary) to access the fuel injector.
• Replace the fuel injector with a new one or clean the existing one using a fuel injector cleaning kit.
• Reassemble the fuel rail and reconnect the injector connector.

4. Perform Compression Test (if needed)

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1 again.
• Insert the compression gauge into the spark plug hole.
• Crank the engine for a few seconds and record the reading. Compare with the manufacturer’s specifications.
• If compression is low, further investigation into the cylinder may be required.