how to fix Honda Civic 10th Generation (2016-2021) check engine light without a scanner

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to reset the check engine light after repairs.

2. Gas Cap Inspection

• Remove the gas cap and inspect it for cracks or damage.
• Clean the gas cap and its sealing surface with a clean cloth.
• Reinstall the gas cap securely and ensure it clicks to confirm proper sealing.

3. Engine Oil Check

• Remove the dipstick and wipe it clean.
• Reinsert the dipstick fully and then remove it to check the oil level.
• If low, add the appropriate oil type as specified in the owner’s manual.

4. Visual Inspection

• Open the hood and visually inspect all wiring and hoses connected to the engine.
• Look for any signs of wear, fraying, or disconnections.
• Secure any loose wires or hoses and replace damaged components as necessary.

5. Vacuum Leak Check

• Start the engine and listen for hissing sounds, which may indicate a vacuum leak.
• Use a spray bottle with soapy water to check connections and hoses; bubbles will form if there’s a leak.
• Replace any faulty hoses or connections.

6. Air Filter Inspection

• Remove the air filter housing cover to access the air filter.
• Inspect the air filter for excessive dirt or clogging; replace if necessary.

7. Battery Terminals Check

• Inspect the battery terminals for corrosion (white powdery substance).
• Clean the terminals with a wire brush and reconnect the battery securely.