what does it mean if my Genesis G70 IG (2017-2023) has code P0303

Learn how to diagnose and fix P0303 cylinder 3 misfire in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and materials.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter

2. Inspect and Replace Ignition Components

• Inspect Spark Plug:

  • Remove the spark plug from cylinder 3 using a socket and ratchet.
  • Check for wear, carbon build-up, or damage; replace if necessary.

• Inspect Ignition Coil:

  • Remove the ignition coil from cylinder 3.
  • Test the coil with a multimeter to ensure it meets specifications; replace if faulty.

3. Check and Clean Fuel Injector

• Remove Fuel Injector:

  • Disconnect the fuel line (use caution with fuel spills) and electrical connector from the injector.
  • Remove the fuel injector from cylinder 3.

• Clean or Replace Injector:

  • Use a fuel injector cleaning kit to clean the injector or replace it if cleaning does not resolve issues.

4. Perform Compression Test

• Compression Testing:
  • Insert the compression tester into the spark plug hole of cylinder 3.
  • Crank the engine and record the compression reading. Compare with manufacturer specifications.

5. Address Mechanical Issues

• Check for Mechanical Damage:
  • If compression is low, inspect for valve or piston issues.
  • Address any timing problems or mechanical failures as necessary.