my Toyota Camry XV70 (2018-2024) has a service engine soon light on what to do

Solution

1. Preparation

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

2. Error Code Diagnosis

• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Turn on the ignition (do not start the engine) and read the codes.
• Document the error codes for further analysis.

3. Inspect and Repair

• Based on the codes retrieved, follow specific repair instructions related to each code. For example:
  • If code P0420 (catalytic converter efficiency) is present, inspect the catalytic converter and exhaust system for leaks or damage.
  • If code P0171 (system too lean) appears, check the MAF sensor and intake for air leaks.
• Clear the codes with the scanner after repairs.

4. Replace Components (if necessary)

• If any components (e.g., spark plugs, MAF sensor, or oxygen sensors) are faulty based on diagnostics, replace them as follows:
  • For spark plug replacement, remove the ignition coils, use a socket wrench to remove old plugs, and install new plugs to manufacturer torque specifications (usually 13-15 lb-ft).
  • For MAF sensor replacement, disconnect the electrical connector, remove the sensor from the air intake tube, and install a new sensor.

5. Final Checks

• Reconnect the negative battery terminal.
• Start the engine and let it idle for a few minutes.
• Use the OBD-II scanner again to ensure no new codes appear.