how to diagnose P0301 misfire code on Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, dielectric grease
• Remove the ignition coil from cylinder 1.
• Unscrew and remove the spark plug using the socket set.
• Inspect the spark plug for signs of wear (carbon buildup, damage).
• If worn, install a new spark plug (gapped correctly) and apply dielectric grease on the boot.
• Reinstall the ignition coil.

3. Check and Replace Ignition Coil

• Tools Required: Socket set
• Remove the ignition coil from cylinder 1.
• Use a multimeter to test for primary and secondary resistance according to manufacturer specifications.
• If the ignition coil is faulty, replace it with a new one and reinstall.

4. Inspect and Test Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaning kit (if needed)
• Disconnect the fuel line and attach the fuel pressure gauge to check for adequate fuel pressure.
• If pressure is low, inspect the fuel pump and filter.
• If the fuel injector is suspected to be clogged, clean it using an injector cleaning kit or replace it if necessary.

5. Perform Compression Test

• Tools Required: Compression gauge
• Remove the spark plug and insert the compression gauge into cylinder 1.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications. If low, further investigation may be needed for internal engine issues.