how to fix P0021 code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Raise the vehicle and secure it on jack stands if accessing the underside.

2. Change Engine Oil and Filter

• Sub-steps:

  1. Drain the old engine oil using a wrench to remove the oil drain plug.
  2. Replace the oil filter using an oil filter wrench.
  3. Reinstall the oil drain plug and refill the engine with the recommended oil type (0W-20 synthetic oil is typical).

• Tools Required: Oil filter wrench, socket set, oil drain pan, funnel.

3. Replace VVT Solenoid

• Sub-steps:

  1. Locate the VVT solenoid on the engine (usually near the camshaft).
  2. Disconnect the electrical connector from the VVT solenoid.
  3. Remove the mounting bolts using a socket set and take out the solenoid.
  4. Install the new VVT solenoid and tighten the bolts to the manufacturer’s specified torque (typically around 8-10 ft-lbs).
  5. Reconnect the electrical connector.

• Tools Required: Socket set, torque wrench.

4. Timing Chain/Belt Inspection

• Sub-steps:

  1. Remove the timing chain cover or belt cover as per the service manual.
  2. Inspect the timing chain/belt for wear, tension, and alignment.
  3. Replace any worn components and ensure proper alignment according to the manufacturer’s specifications during reassembly.

• Tools Required: Socket set, torque wrench, timing tools (if needed).

5. Clear Codes and Test Drive

• Sub-steps:

  1. Reconnect the negative battery terminal.
  2. Use an OBD-II scanner to clear the P0021 code from the vehicle’s memory.
  3. Test drive the vehicle to ensure the issue is resolved.

• Tools Required: OBD-II scanner.