how to fix the P0301 misfire code in my Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Gather tools: socket set, torque wrench, spark plug socket, compression tester, OBD-II scanner.

2. Inspect and Replace Spark Plug

• Remove the ignition coil for cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket and inspect for wear or fouling.
• If the spark plug is worn, replace it with a new one, ensuring it is gapped to the manufacturer's specifications (typically around 0.043 inches for most Honda models).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for cracks or damage.
• If defective, replace the ignition coil with a new one.
• Reinstall the ignition coil and secure it with the retaining bolts.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a multimeter to test the injector’s resistance; it should typically be within the manufacturer’s specified range.
• If faulty, replace the fuel injector and ensure the new one is properly seated and connected.

5. Perform Compression Test

• Remove the spark plug from cylinder 1 and insert the compression tester.
• Crank the engine and record the compression reading; it should meet the manufacturer’s specifications (usually around 180 psi for most Honda engines).
• If compression is low, further diagnosis may be needed to check for internal engine issues.

6. Reassemble and Reset

• Reinstall the spark plug, ignition coil, and any components removed during the inspection.
• Reconnect the negative battery terminal.
• Clear the P0301 code using the OBD-II scanner.