how to fix P0021 code in Volkswagen Golf MK7.5 (2020-Present)

Learn how to diagnose and fix P0021 camshaft timing issue in Volkswagen Golf MK7.5. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Change Engine Oil and Filter

• Sub-steps:
  1. Lift the vehicle and secure it on jack stands.
  2. Place a drain pan under the oil pan and remove the oil drain plug.
  3. Allow old oil to drain completely, then replace the drain plug.
  4. Remove the old oil filter using an oil filter wrench.
  5. Install a new oil filter, lubricating the rubber gasket with new oil.
  6. Fill the engine with the manufacturer-recommended oil type and quantity.

3. Replace VVT Solenoid

• Sub-steps:
  1. Locate the VVT solenoid, typically found on the cylinder head.
  2. Disconnect the electrical connector from the solenoid.
  3. Remove the mounting bolts securing the solenoid to the engine.
  4. Remove the old solenoid and replace it with a new one.
  5. Reconnect the electrical connector and ensure it clicks into place.

4. Verify Camshaft Timing

• Sub-steps:
  1. Remove any necessary components to access the timing cover (if applicable).
  2. Align the timing marks on the crankshaft and camshaft according to the manufacturer’s specifications.
  3. If the timing is off, adjust as necessary by repositioning the timing chain or belt.
  4. Reassemble timing cover and any components removed.

5. Clear Codes and Test

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0021 code from the system.
  3. Start the engine and monitor for smooth operation.
  4. Perform a test drive to confirm that the issue has been resolved.