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

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, and basic hand tools.
• Disconnect the negative battery terminal to ensure safety while working on the ignition and fuel system components.

2. Replace Ignition Coil

• Remove the engine cover if equipped, using the appropriate socket.
• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the bolt securing the ignition coil using a socket.
• Pull the ignition coil straight out of the cylinder head.
• Install the new ignition coil by reversing the removal process, ensuring it is seated properly and secured with the bolt.

3. Replace Spark Plug

• Remove the ignition coil from cylinder 1 as described in the previous step.
• Using a spark plug socket, remove the spark plug from the cylinder head.
• Inspect the spark plug for wear, carbon buildup, or damage.
• Install the new spark plug, tightening it to the manufacturer's specifications (usually around 22 lb-ft).
• Reinstall the ignition coil on top of the new spark plug.

4. Check Fuel Injector

• If ignition components are confirmed functional, test the fuel injector on cylinder 1.
• Disconnect the fuel injector connector and use a multimeter to test for proper resistance (usually around 12-16 ohms).
• If the injector is faulty, replace it with a new part.

5. Compression Test

• If misfire persists, conduct a compression test on cylinder 1.
• Remove the spark plug and screw in the compression tester.
• Crank the engine and record the compression reading.
• Compare the reading to the manufacturer’s specifications; a low reading indicates potential internal engine issues.