how to resolve P0301 code on my Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil cover if applicable.
• Unscrew the spark plug from cylinder 1 using the spark plug socket.
• Inspect the spark plug for signs of wear or fouling. Replace it if necessary.
• Install the new spark plug and torque it to the manufacturer’s specifications (usually around 20-30 Nm).
• Reconnect the ignition coil.

3. Test and Replace Ignition Coil

• Tools Required: Multimeter, socket set.
• Disconnect the ignition coil connector.
• Use a multimeter to check the resistance of the coil. If it is out of specification, replace the ignition coil.
• Reinstall the new ignition coil, ensuring it is seated properly.
• Reconnect the connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner kit, safety glasses.
• Disconnect the fuel injector connector.
• Remove the fuel injector from cylinder 1 using appropriate tools.
• Clean the fuel injector using a cleaning kit or replace if necessary.
• Reinstall the fuel injector and reconnect the connector.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading. It should be within the manufacturer’s specified range.
• If the reading is low, further investigation into the engine's internal components is necessary.