how to diagnose P0302 code on Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to avoid electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary.
• Use a socket wrench to remove the spark plug from cylinder 2.
• Inspect the spark plug for wear and carbon buildup.
• Replace with a new spark plug that matches OEM specifications (typically NGK or Bosch).

3. Check and Replace Ignition Coil

• Unplug the ignition coil connector for cylinder 2.
• Remove the ignition coil using a socket wrench.
• Inspect the coil for cracks or signs of damage.
• Replace with a new ignition coil if necessary.

4. Compression Test

• Remove the spark plug from cylinder 2.
• Insert a compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• If the reading is below the manufacturer's specification, further investigation is needed (e.g., valve issues, piston rings).

5. Fuel Injector Inspection

• Disconnect the fuel injector connector for cylinder 2.
• Use a multimeter to check for proper resistance (within specifications).
• If the injector is faulty, replace it with a new injector.
• Reconnect the fuel injector and check for proper operation.