how to fix P0301 misfire code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Extract the spark plug using the spark plug socket.
• Inspect the spark plug for signs of wear, such as carbon buildup or electrode damage.
• If necessary, replace the spark plug with a new one, ensuring it is gapped correctly to manufacturer specifications (typically 0.043 inches for a Toyota Camry).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil

• Tools Required: Multimeter.
• Check the resistance of the ignition coil using a multimeter. Compare readings with manufacturer specifications (usually between 0.4-0.6 ohms for primary resistance).
• If the ignition coil is defective, replace it with a new one.
• Reconnect the ignition coil after replacement.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, cleaning kit.
• Disconnect the fuel injector connector and remove the fuel rail if necessary.
• Inspect the fuel injector for blockages or leaks.
• Clean the fuel injector using a fuel injector cleaning kit or replace it if cleaning does not resolve the issue.
• Reinstall the fuel injector and reconnect the fuel rail.

5. Perform Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from Cylinder 1 and insert the compression gauge.
• Crank the engine and read the compression value. It should be within the manufacturer’s specified range (typically around 180-200 psi).
• If compression is low, further inspection of the piston rings, valves, or head gasket may be necessary.