how to fix P0021 timing code in Volkswagen Golf Seventh Generation (2013-2020)

Learn how to diagnose and fix P0021 timing code in Volkswagen Golf (2013-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

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

2. Check and Replace Engine Oil

1. Drain Engine Oil:
   • Place an oil drain pan under the oil pan.
   • Remove the drain plug using a socket and let the oil completely drain.
2. Replace Oil Filter:
   • Remove the old oil filter using an oil filter wrench.
   • Apply a thin layer of oil to the rubber gasket of the new filter.
   • Install the new oil filter and tighten by hand.
3. Add New Engine Oil:
   • Replace the drain plug and tighten to the manufacturer’s specified torque (usually around 25 Nm).
   • Fill the engine with the recommended oil type and quantity as per the owner’s manual.

3. Inspect and Replace VVT Solenoid

1. Locate the VVT Solenoid:
   • Remove any necessary engine covers to access the VVT solenoid.
2. Remove the Solenoid:
   • Disconnect the electrical connector from the solenoid.
   • Remove the mounting bolts with a socket and carefully lift the solenoid out.
3. Install New Solenoid:
   • Position the new solenoid and secure it with the mounting bolts.
   • Reconnect the electrical connector.

4. Timing Chain/Belt Inspection

1. Remove Timing Cover:
   • Remove any components obstructing access to the timing cover (e.g., serpentine belt, pulleys).
   • Unbolt and remove the timing cover.
2. Inspect Timing Components:
   • Check the timing chain/belt for wear or slack.
   • Inspect the tensioner and guides for proper function.
3. Replace if Necessary:
   • If any components show wear, replace the timing chain/belt and tensioner.

5. Clear Codes and Test Drive

1. Reconnect Battery:
   • Reconnect the battery terminals.
2. Clear the Codes:
   • Use the OBD-II scanner to clear any stored trouble codes.
3. Test Drive:
   • Drive the vehicle under various conditions to ensure the issue is resolved.