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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1:
  1. Disconnect the ignition coil connector.
  2. Remove the bolts securing the coil.
  3. Gently pull the coil out of the spark plug well.
• Remove the spark plug:
  1. Use the spark plug socket to unscrew and remove the old spark plug.
  2. Inspect the spark plug for signs of wear or damage (e.g., fouling, excessive gap).
• If necessary, replace with a new spark plug, ensuring the gap is set to manufacturer specifications (typically around 0.043 inches).
• Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or faulty, replace it:
  1. Remove the old ignition coil as described above.
  2. Install the new ignition coil in the same position.
  3. Reconnect the ignition coil connector.

4. Check Fuel Injector Operation

• Tools Required: Fuel pressure gauge, injector cleaning kit (if needed).
• Connect a fuel pressure gauge to the fuel rail to check for proper fuel pressure (consult the service manual for specifications).
• If pressure is low, inspect the fuel pump and filter for issues.
• If the injector is suspected to be clogged, use an injector cleaning kit to clean it.

5. Perform a Cylinder Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1 and screw in the compression gauge.
• Crank the engine and note the compression reading; it should match the manufacturer’s specifications (usually around 180 psi).
• If the compression is low, further diagnosis (e.g., valve issues, head gasket) may be necessary.