my Honda CR-V Sixth Generation (2023-present) has a check engine light and code P0301, what's wrong?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, spark plug socket, torque wrench, fuel injector tester, compression tester, multimeter.
• Ensure the vehicle is parked on a level surface and the engine is cool before starting work.

2. Inspect and Replace Spark Plug

1. Disconnect the negative battery terminal to prevent any electrical shorts.
2. Remove the engine cover if applicable to access the spark plugs.
3. Use a socket wrench to remove the spark plug from cylinder 1.
4. Inspect the spark plug for signs of wear, fouling, or damage.
5. If necessary, replace with a new spark plug, ensuring it is gapped correctly (consult the owner's manual for specifications).
6. Torque the spark plug to the specified value (typically around 13 lb-ft).

3. Inspect and Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil in cylinder 1.
2. Remove the ignition coil bolt using a socket wrench.
3. Pull the ignition coil out of the spark plug well.
4. Inspect the ignition coil for any visible damage or corrosion.
5. If faulty, replace the ignition coil with a new one, and reattach the bolt and connector.

4. Test Fuel Injector

1. Disconnect the fuel injector connector for cylinder 1.
2. Use a fuel injector tester to check for proper operation.
3. If the injector fails the test, replace it with a new one.
4. Reconnect the fuel injector connector after testing or replacement.

5. Compression Test

1. Remove the spark plug from cylinder 1 to access the combustion chamber.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine for a few seconds and record the compression reading.
4. Compare the reading against the manufacturer's specifications (typically around 180-200 psi).
5. If compression is low, further diagnosis may be needed for internal engine issues.