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

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

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, torque wrench, compression gauge, multimeter, replacement spark plug, ignition coil (if needed), fuel injector cleaner.
• Disconnect the battery to ensure safety while working on the electrical systems.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Use a socket wrench to remove the spark plug for cylinder 1.
• Inspect the removed spark plug for wear; if it is fouled or worn, replace it with a new spark plug, ensuring it is gapped correctly.
• Torque the new spark plug to the manufacturer’s specifications (usually around 13-16 lb-ft).

3. Test and Replace Ignition Coil

• Using a multimeter, check the ignition coil’s resistance according to the service manual specifications.
• If the ignition coil is faulty, remove it by unscrewing the bolts and disconnecting the electrical connector.
• Replace with a new ignition coil and reassemble.

4. Clean or Replace Fuel Injector

• If the fuel injector for cylinder 1 is clogged, use a fuel injector cleaner to attempt to clean it.
• If cleaning does not resolve the issue, replace the fuel injector by unscrewing it from the fuel rail, disconnecting the electrical connector, and installing a new injector.

5. Perform Compression Test

• If misfire persists, perform a compression test using a compression gauge on cylinder 1.
• If compression is low, further investigation into potential internal engine issues may be required (valve seating, piston rings).

6. Reassemble and Test

• Reconnect the battery, ensure all components are secured, and reattach any removed engine covers.
• Start the engine and allow it to idle to ensure no misfire is present.