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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel pressure gauge.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before performing any service.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and remove the coil using a socket.
• Remove the spark plug using a spark plug socket. Inspect for signs of wear, fouling, or damage.
• Install a new spark plug with the correct gap (0.043 inches for Toyota Camry).
• Torque the spark plug to 13 lb-ft.
• Reinstall the ignition coil and connector. Repeat for cylinder 1.

3. Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or if the spark plug replacement does not resolve the issue, replace the ignition coil.
• Remove the old ignition coil and install the new one, ensuring a secure fit.
• Reconnect the ignition coil connector.

4. Check Fuel Injector

• Remove the fuel injector connector and inspect for electrical integrity using a multimeter.
• Replace the fuel injector if it shows signs of failure (e.g., open circuit).
• Reconnect the fuel injector and ensure it is seated properly in the intake manifold.

5. Conduct Compression Test

• Remove the spark plug from cylinder 1 and insert the compression tester.
• Crank the engine for several seconds and record the compression reading.
• Compare to manufacturer specifications (typically 170-200 psi). If low, further investigation into valves or piston rings may be necessary.