my Volkswagen Passat B8 (2015-2022) has a check engine light with P0302 code, what does it mean?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Noid light (for fuel injector testing)

2. Inspect Ignition Components

1. Remove the engine cover if applicable.
2. Disconnect the ignition coil electrical connector from cylinder 2.
3. Remove the ignition coil using a socket wrench.
4. Inspect the spark plug in cylinder 2 for wear and carbon buildup; replace if necessary.
5. Test the ignition coil for resistance using a multimeter; replace if out of spec.

3. Check Fuel Injector

1. Disconnect the fuel injector connector for cylinder 2.
2. Use a noid light to check for injector pulse; if there's no pulse, check the wiring back to the ECU.
3. If the pulse is present, remove the fuel injector and test it for proper operation (using a fuel injector tester or by checking for leaks).
4. Clean or replace the fuel injector as needed.

4. Perform Compression Test

1. Remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading; compare it to manufacturer's specifications.
4. If compression is low, further investigation into piston rings or valves may be necessary.

5. Check for Vacuum Leaks

1. Visually inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
2. Use an intake cleaner spray around the intake manifold while the engine is running to identify any hissing sounds indicating a vacuum leak.
3. Repair any leaks found.