how to resolve P0302 code in Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connector for cylinder 2.
  3. Remove the ignition coil from cylinder 2 using a socket.
  4. Extract the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for wear or damage; replace it if necessary.
  6. Install a new spark plug (use OEM specifications) and torque it to the manufacturer’s specification (typically around 20 Nm).
  7. Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Fuel Injector (if needed)

• Sub-steps:
  1. Disconnect the fuel pump relay and crank the engine to relieve fuel pressure.
  2. Remove the intake manifold if access to the fuel injector is obstructed (consult service manual for specific removal steps).
  3. Disconnect the electrical connector from the fuel injector for cylinder 2.
  4. Unclip and remove the fuel injector from its rail.
  5. Inspect the fuel injector for clogs and test for proper operation (use a fuel injector tester).
  6. Replace with a new injector if it fails the test or shows signs of damage.
  7. Reinstall all components in reverse order, ensuring proper connection and sealing.

4. Perform Compression Test (if necessary)

• Sub-steps:
  1. Remove the spark plug for cylinder 2.
  2. Insert a compression gauge into the spark plug hole.
  3. Crank the engine several times to get a reading.
  4. Compare the reading with the manufacturer's specifications (usually around 150-200 psi).
  5. If compression is low, further investigation is needed (potential valve or piston issues).