how to troubleshoot P0301 misfire code in Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover (if applicable) to access the spark plug.
• Disconnect the ignition coil connector and remove the ignition coil.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear or fouling; replace if necessary.
• Install the new spark plug, torquing it to the manufacturer’s specifications (usually around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil.
• Tools Required: Socket set.
• Remove the ignition coil from cylinder 1.
• Compare the coil to the specifications; replace if it appears damaged.
• Install the new ignition coil, ensuring a secure fit and reconnecting the electrical connector.

4. Inspect and Test Fuel Injector

• If misfire persists, test the fuel injector for cylinder 1.
• Tools Required: Fuel pressure gauge, multimeter.
• Disconnect the fuel injector connector.
• Use the multimeter to check the resistance of the injector; it should typically read between 12-16 ohms.
• If the injector is faulty, replace it with a new one.

5. Perform Compression Test

• If the issue remains unresolved, perform a compression test on cylinder 1.
• Tools Required: Compression gauge.
• Remove the spark plug and insert the compression gauge into the spark plug hole.
• Crank the engine and record the compression reading; it should meet manufacturer specifications.
• If the compression is low, further investigation into engine internals may be necessary.