how to fix P0021 code in Volkswagen Golf MK6 (2009-2014)

Learn how to diagnose and fix P0021 camshaft timing issue in Volkswagen Golf MK6 (2009-2014). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety.
• Ensure the vehicle is on a flat surface and secure with wheel chocks.

2. Check and Change Engine Oil

• Sub-steps:
  1. Remove the oil drain plug using a socket wrench and drain the old oil into a container.
  2. Replace the oil filter using an oil filter wrench.
  3. Reinstall the drain plug and tighten to the manufacturer's torque specifications.
  4. Fill the engine with fresh oil that meets the manufacturer's specifications.
• Tools Required: Oil drain pan, socket set, oil filter wrench, new oil filter, new engine oil.
• Safety Warnings: Allow engine to cool before draining oil. Ensure proper disposal of old oil.

3. Inspect and Replace VVT Solenoid

• Sub-steps:
  1. Locate the VVT solenoid on the engine (typically near the camshaft cover).
  2. Disconnect the electrical connector and remove the mounting bolts.
  3. Remove the solenoid from its position and inspect the gasket for damage.
  4. Install the new solenoid with a new gasket, ensuring it is securely mounted.
  5. Reconnect the electrical connector.
• Tools Required: Socket set, torque wrench, gasket scraper (if needed).
• Safety Warnings: Ensure the engine is cool to avoid burns.

4. Adjust Timing Chain/Belt

• Sub-steps:
  1. Remove the timing cover to access the timing chain/belt.
  2. Align the camshaft and crankshaft timing marks according to the service manual.
  3. If necessary, replace the timing chain/belt and tensioner.
  4. Reassemble the timing cover and ensure all bolts are torqued to specifications.
• Tools Required: Timing tool set, socket set, torque wrench.
• Safety Warnings: Disconnect the battery before working on timing components.