how to fix the P0303 code in my Honda CR-V Fifth Generation (2017-2022)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 3; use a socket wrench to remove it.
• Inspect the spark plug for signs of wear (fouling, cracks).
• If necessary, replace with a new spark plug, ensuring it meets OEM specifications (typically NGK or Denso).
• Torque the new spark plug to the manufacturer’s specification (usually around 13 lb-ft).

3. Check and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil for cylinder 3.
• Remove the ignition coil by unscrewing any bolts and lifting it straight out.
• Test the coil with a multimeter (consult the vehicle service manual for resistance values).
• If faulty, replace it with a new ignition coil that meets OEM specifications.
• Reinstall the coil, reconnect the electrical connector, and secure it in place.

4. Inspect and Test Fuel Injector

• Locate the fuel injector for cylinder 3.
• Disconnect the electrical connector and test the injector with a noid light or multimeter to check for proper signal.
• If the injector is not functioning correctly, remove it and replace it with a new one.
• Ensure to use a new O-ring for proper sealing during installation.

5. Compression Test

• Remove the spark plug from cylinder 3.
• Insert a compression tester into the spark plug hole and crank the engine for a few seconds.
• Compare the reading with the specifications in the service manual. If compression is low, further investigation into the engine internals may be necessary.