how to fix P0301 misfire code in Genesis G70 IG (2017-2023)?

Learn how to diagnose and fix P0301 cylinder 1 misfire in Genesis G70 (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before beginning work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the ignition coil cover if applicable.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil using a socket.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear; replace if necessary. Ensure the gap is set to the manufacturer’s specifications (typically around 0.028-0.031 inches).
• Install the new or inspected spark plug and torque to specification (usually around 13-15 lb-ft).
• Reinstall the ignition coil and connector.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• If the spark plug inspection reveals no issues, test the ignition coil using a multimeter for resistance (refer to the vehicle’s service manual for specifications).
• If faulty, remove the ignition coil and replace it with a new one, ensuring to torque it to manufacturer specifications.

4. Test Fuel Injector

• Tools Required: Multimeter or noid light.
• Check the fuel injector resistance; if it’s outside specifications, replace the injector.
• Reinstall the injector, ensuring all connections are secure.

5. Compression Test

• Tools Required: Compression tester.
• Remove all spark plugs for accurate reading.
• Insert the compression tester into cylinder 1 and crank the engine; record the compression reading.
• Compare readings to specifications (typically around 150-200 psi). Replace the cylinder head gasket or repair any underlying issues if low compression is found.