what causes the check engine light to keep coming on in my Toyota Tacoma N300 (2016-Present)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a level surface and the engine is cool.

2. Address Diagnostic Trouble Codes

• Sub-step 1: Use the OBD-II scanner to read and record the trouble codes.
• Sub-step 2: Research the codes to determine the underlying issues (e.g., P0420 for catalytic converter efficiency).
• Sub-step 3: Depending on the codes, proceed to repair the identified components (e.g., replace faulty sensors, repair wiring harnesses).

3. Inspect and Replace Components

• Sub-step 1: If the gas cap is faulty, replace it with a new OEM gas cap.
• Sub-step 2: If spark plugs or ignition coils are worn, remove the old components using a socket set and replace them with new ones, ensuring proper torque (typically 15-20 ft-lbs for spark plugs).
• Sub-step 3: For air intake issues, clean or replace the air filter and check for proper sealing of the intake manifold.

4. Clear Codes and Test

• Sub-step 1: Reconnect the negative battery terminal.
• Sub-step 2: Use the OBD-II scanner to clear the stored trouble codes.
• Sub-step 3: Start the engine and monitor if the check engine light reappears.