how to fix P0300 random misfire code in Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge.
• Ensure the vehicle is parked on a level surface, and the engine is off. Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil covers (if applicable) using a socket set.
• Remove the spark plugs using a spark plug socket and inspect for wear, carbon buildup, or damage.
• Replace any faulty spark plugs with OEM or high-quality aftermarket spark plugs, ensuring the gap is set to manufacturer specifications.
• Reinstall the ignition coils and covers, torquing to manufacturer specifications.

3. Check and Replace Ignition Coils (if necessary)

• Test each ignition coil with a multimeter to ensure they are within the specified resistance range.
• If any coils are faulty, disconnect the wiring harness and remove the defective coil using a socket set.
• Install the new ignition coil, ensuring a secure fit and reconnect the wiring harness.

4. Inspect and Test Fuel System

• Use a fuel pressure gauge to check the fuel pump pressure against the manufacturer's specifications.
• If pressure is low, check the fuel filter for clogs and replace if necessary.
• Inspect fuel injectors for proper operation. Cleaning or replacing faulty injectors may be required.

5. Check for Vacuum Leaks

• Inspect all vacuum lines for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to test for leaks. If detected, replace the damaged lines or seals.

6. Verify Engine Compression

• Remove spark plugs and use a compression gauge in each cylinder.
• Compare the readings to manufacturer specifications. Low compression in any cylinder may require further investigation or repair.