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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel injector cleaner.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary.
• Locate and remove the spark plug from cylinder 2 using a socket wrench.
• Inspect the spark plug for wear, carbon buildup, or damage.
• If damaged, replace the spark plug with a new one, ensuring proper gap and torque (typically 20-30 Nm).
• Reinstall the ignition coil securely.

3. Test and Replace Ignition Coil

• Remove the ignition coil from cylinder 2.
• Use a multimeter to measure resistance; it should typically be within manufacturer specifications (consult repair manual).
• If out of range, replace the ignition coil with a new one, ensuring to torque to manufacturer specifications.

4. Inspect Fuel Injector

• Disconnect the fuel injector connector and remove the injector from cylinder 2.
• Inspect for clogs or damage; clean with fuel injector cleaner if needed or replace if defective.
• Reinstall the injector and reconnect the electrical connector.

5. Perform Compression Test

• Remove the spark plug from cylinder 2 and insert the compression tester.
• Crank the engine a few times and note the reading; it should be within specifications (consult repair manual).
• If compression is low, investigate further for potential internal engine issues.