how to fix P0300 code in Genesis G70 IG (2017-2023)

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, torque wrench, fuel pressure gauge, multimeter, replacement spark plugs, ignition coils (if necessary), vacuum gauge.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Spark Plugs

• Remove the engine cover if applicable using a socket set.
• Disconnect the ignition coils by removing the electrical connectors.
• Unbolt and remove the ignition coils from the spark plugs.
• Remove the old spark plugs using a spark plug socket.
• Inspect the spark plugs for wear; replace them if they are worn or fouled.
• Install new spark plugs with the correct torque specification (typically 13-16 lb-ft).
• Reinstall ignition coils and reconnect electrical connectors.

3. Inspect and Replace Ignition Coils (if necessary)

• If the ignition coils are damaged or faulty, replace them with new units.
• Install new ignition coils over the spark plugs and secure them with bolts.
• Reconnect the electrical connectors to each ignition coil.

4. Check Fuel System

• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition on but do not start the engine to check the fuel pressure; it should match manufacturer specifications (typically around 50-60 psi).
• If the pressure is low, inspect the fuel pump and filter for issues, and replace as necessary.

5. Inspect Air Intake and Vacuum Leaks

• Visually inspect the air intake system for cracks or disconnected hoses.
• Perform a smoke test to identify any vacuum leaks.
• Repair or replace any damaged hoses or components.