how to fix P0021 code in Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Ensure the vehicle is on a flat surface and safely supported.

2. Change Engine Oil and Filter

• Tools Required: Oil filter wrench, socket set, drain pan, funnel
• Drain the old engine oil using a drain pan.
• Replace the oil filter with a new one.
• Refill the engine with the appropriate oil type as specified in the owner's manual (typically 0W-20 for Honda Civic).

3. Replace VVT Oil Control Valve

• Tools Required: Socket set, ratchet, torque wrench
• Locate the VVT oil control valve, typically found near the camshaft.
• Disconnect the electrical connector and remove the mounting bolts.
• Replace it with a new VVT oil control valve and torque to specification (usually around 7-9 ft-lbs).
• Reconnect the electrical connector.

4. Inspect and Adjust Timing Chain/Belt

• Tools Required: Timing tool kit, socket set, torque wrench
• Remove the timing chain/belt cover to access the timing components.
• Verify that the timing marks on the camshaft and crankshaft align as per specifications.
• If misaligned, adjust the timing chain/belt accordingly, ensuring proper tension.
• Reinstall the timing cover and torque to specification.

5. Clear Codes and Test

• Tools Required: OBD-II scanner
• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0021 code.
• Start the engine and allow it to reach normal operating temperature.