how to fix the P0302 misfire code on my Volkswagen Golf MK5 (2004-2008)

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Unplug the ignition coil connector from cylinder 2.
• Remove the ignition coil using a socket set.
• Remove the spark plug with a spark plug socket.
• Inspect the spark plug for wear; if damaged, replace it with a new one.
• Install the new spark plug and torque it to 20 Nm (15 ft-lbs).
• Reinstall the ignition coil and connector.

3. Test and Replace Ignition Coil

• If the coil was suspected to be faulty, test it with a multimeter for resistance (should be around 0.4-0.6 ohms for primary and 8-12 k-ohms for secondary).
• If outside specifications, replace the ignition coil with a new one.
• Reconnect the ignition coil and ensure it is seated properly.

4. Inspect and Clean Fuel Injector

• Disconnect the fuel line and electrical connector from the fuel injector.
• Remove the fuel injector from the intake manifold.
• Clean the injector with a specialized cleaner or replace it if it is clogged or malfunctioning.
• Reinstall the injector and reconnect the fuel line and electrical connector.

5. Perform Compression Test

• Remove the spark plug from cylinder 2.
• Attach a compression tester to the spark plug hole.
• Crank the engine for a few seconds and record the compression reading.
• Compare it to the manufacturer's specifications (typically around 180-200 psi). If low, further investigation into cylinder health is needed.