how to fix P0302 misfire code on Volkswagen Tiguan First Generation (2007-2018)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, spark plug socket, compression tester, fuel injector cleaner.
• Disconnect the battery to avoid any electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug and Ignition Coil

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the electrical connector from the ignition coil on cylinder 2.
  3. Unscrew the ignition coil using a socket wrench and remove it from the spark plug.
  4. Remove the spark plug with a spark plug socket.
  5. Inspect the old spark plug for signs of wear, damage, or fouling.
  6. Install the new spark plug (recommended torque: 20 Nm).
  7. Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Use a multimeter to check the resistance of the injector (should be within manufacturer’s specifications).
  3. If necessary, clean the injector with a fuel injector cleaner.
  4. Reconnect the fuel injector and ensure it clicks into place.

4. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine several times to take a reading (should be within manufacturer’s specifications).
  4. If compression is low, further diagnosis is needed for potential internal engine issues.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold.
  2. Use a smoke machine or carburetor cleaner to detect leaks while the engine is running.
  3. Repair or replace any damaged hoses found during inspection.