how can I fix the P0301 code on my Toyota Corolla E210 (2019-2024)?

Solution

1. Preparation

• Gather required tools and parts.
• Ensure the engine is cool and disconnect the negative battery terminal.

2. Replace Spark Plug (if necessary)

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil connector from the coil on cylinder 1.
3. Remove the ignition coil using a socket or wrench.
4. Remove the spark plug using a spark plug socket and ratchet.
5. Inspect the old spark plug for signs of wear (e.g., carbon buildup, electrode wear).
6. Install a new spark plug, ensuring it is gapped correctly (check specifications for gap size).
7. Reinstall the ignition coil and connect the ignition coil connector.

3. Replace Ignition Coil (if necessary)

1. If the ignition coil is faulty, remove it as described above.
2. Install a new ignition coil onto cylinder 1, ensuring it seats properly.
3. Reconnect the ignition coil connector.

4. Fuel Injector Cleaning or Replacement (if necessary)

1. If the injector is suspected of being clogged, consider using a fuel injector cleaner or replacing it.
2. To replace, disconnect the fuel line and electrical connector from the injector.
3. Remove the old injector from the intake manifold.
4. Install the new injector with a new O-ring, ensuring it is seated correctly.
5. Reconnect the fuel line and electrical connector.

5. Compression Test (if necessary)

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine a few times to get a reading.
4. Compare the compression reading with manufacturer specifications. If low, further diagnostics on the engine may be required.