how to diagnose P0301 misfire code in Skoda Octavia NFL (2020-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, fuel pressure gauge, multimeter, noid light.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Unplug the electrical connector.
  • Remove the retaining bolts and gently pull the coil out.
• Inspect the spark plug:
  • Use a spark plug socket to remove the spark plug.
  • Check for wear, carbon buildup, or damage.
• Replace the spark plug if necessary:
  • Gap the new spark plug according to specifications.
  • Install the new spark plug and torque it to the manufacturer's specification (typically around 20 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if needed)

• If the spark plug is fine, test the ignition coil:
  • Use a multimeter to check the primary and secondary resistance of the coil.
• If the coil is faulty, replace it with a new one:
  • Install the new ignition coil and ensure it is securely connected.

4. Check Fuel Injector

• Inspect the fuel injector for cylinder 1:
  • Use a noid light to check for proper pulse and operation.
• If the injector is faulty, replace it:
  • Disconnect the fuel line and electrical connector.
  • Remove the injector using the appropriate tools and install a new one.
  • Reconnect the fuel line and electrical connector.

5. Compression Test

• Perform a compression test on cylinder 1:
  • Remove the spark plug and connect the compression tester.
  • Crank the engine and record the compression reading.
• If compression is low, diagnose further for potential valve or piston issues.