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

Solution

1. Preparation

• Gather all 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

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from cylinder 1.
  3. Remove the ignition coil using a socket wrench.
  4. Remove the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear or damage; replace if necessary.
  6. Install a new spark plug, ensuring it is gapped correctly (0.043 inches for most models).
  7. Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is in good condition, test the ignition coil with a multimeter for proper resistance.
  2. If the coil is faulty, remove it from the engine.
  3. Install a new ignition coil for cylinder 1.
  4. Reconnect the ignition coil connector.

4. Inspect and Clean Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Remove the fuel rail if necessary to access the injector.
  3. Inspect the injector for clogs or leaks.
  4. Clean the injector using an injector cleaner kit or replace it if damaged.
  5. Reinstall the fuel rail and reconnect the fuel injector connector.

5. Compression Testing (If Needed)

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert a compression gauge into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Repeat for comparison with other cylinders. Low compression may indicate mechanical failure.
  5. If compression is low, further investigation is needed (e.g., valve job, head gasket replacement).