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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool down before beginning work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil using the socket set.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, damage, or carbon buildup. Replace if necessary.
• Apply a small amount of dielectric grease to the ignition coil connector.
• Install the new or inspected spark plug, torque it to the manufacturer's specification (typically around 20-30 Nm).
• Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Fuel Injector

• Tools Required: Fuel line disconnect tool, socket set.
• Relieve fuel system pressure using the Schrader valve on the fuel rail.
• Disconnect the fuel injector connector and remove the retaining clip.
• Carefully remove the fuel injector from the rail.
• Inspect the injector for clogs or leaks. Replace if necessary.
• Install a new fuel injector, ensuring it is seated properly in the fuel rail.
• Reconnect the fuel injector connector and reinstall the retaining clip.

4. Check Compression

• Tools Required: Compression tester.
• Remove spark plugs from all cylinders for safety and ease of testing.
• Insert the compression tester into the spark plug hole for cylinder 2.
• Crank the engine for a few seconds and read the compression value.
• Compare the reading to the manufacturer's specifications (typically 140-200 psi).
• If compression is low, further inspection of the valves, piston rings, or head gasket may be necessary.