Honda Civic 9th Generation (2012-2015) check engine light keeps coming on, how do I fix it?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, vacuum gauge, fuel pressure gauge.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Address Identified Issues

• If Error Codes Indicate Ignition Issues:

  1. Disconnect the negative battery terminal.
  2. Remove the ignition coils and spark plugs using the socket set.
  3. Inspect spark plugs for wear; replace if necessary.
  4. Install new spark plugs, tightening to manufacturer specifications (typically 13-16 lb-ft).
  5. Reinstall ignition coils and reconnect the battery terminal.

• If Error Codes Indicate Fuel System Problems:

  1. Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
  2. Disconnect the fuel lines from the fuel rail using the appropriate tools.
  3. Attach a fuel pressure gauge to the fuel rail and check for proper pressure (typically 40-50 psi).
  4. If pressure is low, replace the fuel pump or filter as necessary.
  5. Reconnect fuel lines ensuring no leaks.

• If Vacuum Leaks Are Detected:

  1. Use a smoke machine or visually inspect hoses for cracks or disconnections.
  2. Replace any damaged vacuum hoses.
  3. Clear any codes from the ECU using the OBD-II scanner.

3. Additional Repairs (if needed)

• If exhaust system issues are indicated, check for blockages or damage:
  1. Inspect the catalytic converter and exhaust pipes for obstructions.
  2. Replace any damaged exhaust components as necessary.