how to fix P0303 code in Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Gather tools and ensure the workspace is clean.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter

2. Inspect and Replace the Spark Plug

1. Remove the ignition coil cover if applicable.
2. Disconnect the ignition coil connector from cylinder 3.
3. Use a socket to remove the ignition coil and set it aside.
4. Remove the spark plug using a spark plug socket and inspect for wear or damage.
5. If necessary, replace the spark plug with a new one, ensuring the gap is set to manufacturer specifications (typically around 0.028-0.032 inches).
6. Reinstall the ignition coil and reconnect the connector. Torque the ignition coil to the manufacturer's specification.

3. Test and Replace the Ignition Coil

1. If the spark plug is in good condition, test the ignition coil using a multimeter to measure resistance. Compare readings to specifications in the service manual.
2. If readings are outside specifications or the coil appears damaged, replace the ignition coil with a new one.
3. Reinstall the ignition coil and reconnect all connectors.

4. Check Compression

1. Remove the spark plug from cylinder 3.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine for a few seconds and read the compression value. Compare it to manufacturer specifications (usually around 180-200 psi).
4. If compression is low, further investigation into the cylinder condition is required, which may involve valve or piston issues.

5. Inspect Fuel Injector

1. Remove the fuel rail if necessary to access the fuel injector for cylinder 3.
2. Check the injector for clogs or electrical issues by testing resistance with a multimeter.
3. If faulty, replace the injector with a new component.