what causes the check engine light to come on in Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather your tools and safety equipment.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to reset the ECU if necessary.

2. Address Detected Codes

• Follow the OBD-II scanner’s instructions to interpret the error codes.
• Replace faulty components based on the codes retrieved (e.g., O2 sensors, catalytic converter, etc.).
  • Example: If P0420 (Catalytic Converter Efficiency) is indicated, inspect and replace the catalytic converter if needed.

3. Inspect and Replace Spark Plugs

• Remove the ignition coil assembly.
• Using a spark plug socket, remove the old spark plugs.
• Check the gap on new spark plugs and install them according to OEM specifications (typically around 0.044 inches for Honda).
• Reinstall ignition coils.

4. Check and Replace Air Filter

• Locate the air filter housing and open it.
• Remove the old air filter and inspect for dirt or damage.
• Install a new air filter ensuring a proper seal.

5. Reassemble and Reset Check Engine Light

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear any stored error codes.
• Start the engine and verify that the check engine light is off.