how to fix P0301 misfire code in Toyota Camry XV40 (2007-2011)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, fuel pressure gauge, multimeter.
• Ensure the vehicle is parked on a level surface and the engine is cool. Disconnect the battery to avoid any electrical shorts while working.

2. Replace Spark Plug

1. Remove the ignition coil cover (if applicable) using the socket set.
2. Disconnect the electrical connector from the ignition coil for cylinder 1.
3. Remove the ignition coil using the socket set.
4. Unscrew and remove the spark plug using a spark plug socket.
5. Inspect the spark plug for wear or damage; replace if necessary with the OEM equivalent.
6. Install the new spark plug and torque it to the manufacturer’s specifications (typically around 13-16 lb-ft).
7. Reinstall the ignition coil and reconnect the electrical connector, ensuring a secure fit.

3. Replace Ignition Coil (if needed)

1. If the ignition coil shows signs of damage or wear during inspection, replace it.
2. Remove any mounting bolts securing the ignition coil.
3. Install the new ignition coil and torque the bolts to specifications.
4. Reconnect the electrical connector to the ignition coil.

4. Check Fuel Injector

1. If the spark plug and ignition coil are in good condition, check the fuel injector for cylinder 1.
2. Disconnect the fuel injector electrical connector.
3. Use a multimeter to test the injector resistance (should be within the specified range; refer to the service manual).
4. If faulty, replace the fuel injector with an OEM equivalent.

5. Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug hole and crank the engine.
3. Note the compression reading; it should be within specification (typically around 180 psi for a healthy engine).
4. If the compression is low, further investigation into valve or piston issues may be necessary.