how to fix P0021 code in Volkswagen Golf MK7 (2015-2019)

Learn how to diagnose and fix P0021 VVT system issues in Volkswagen Golf MK7 (2015-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Engine Oil

• Sub-steps:
  1. Drain the engine oil using a wrench to remove the oil drain plug.
  2. Replace the oil filter with a new one.
  3. Refill the engine with the correct grade of oil as specified in the owner’s manual.

Tools Required: Oil pan, wrench set, new oil filter, new engine oil.

3. Replace VVT Solenoid

• Sub-steps:
  1. Locate the VVT solenoid on the engine.
  2. Disconnect the electrical connector from the solenoid.
  3. Remove the mounting bolts using a socket set.
  4. Remove the old solenoid and install the new one, ensuring proper alignment.
  5. Reconnect the electrical connector and torque the bolts to the manufacturer’s specification.

Tools Required: Socket set, torque wrench, screwdriver.

4. Timing Chain/Belt Inspection

• Sub-steps:
  1. Remove any components obstructing access to the timing cover (e.g., intake manifold, accessories).
  2. Remove the timing cover to inspect the timing chain/belt.
  3. Check for wear, stretch, or misalignment; replace if necessary.
  4. Reassemble in the reverse order, ensuring to torque all bolts to specification.

Tools Required: Socket set, torque wrench, timing cover gasket (if replaced).

5. Clear Codes and Test

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear any fault codes.
  3. Start the engine and let it run for a few minutes.
  4. Conduct a test drive to ensure the issue is resolved.

Tools Required: OBD-II scanner.