what should I do if my Toyota Camry check engine light keeps coming on

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, multimeter, and basic hand tools.
• Disconnect the negative battery terminal to prevent electrical shorts during repair.

2. Address Fault Codes

• Use the OBD-II scanner to retrieve any stored fault codes.
• Research codes to determine the specific component or system needing attention (e.g., P0420 for catalytic converter efficiency).

3. Inspect and Replace Components

• For ignition system issues:
  • Remove ignition coils and spark plugs.
  • Inspect for wear; replace if necessary (use OEM parts for best compatibility).
• For vacuum leaks:
  • Inspect hoses and connections; replace any damaged or cracked hoses.

4. Reset the Check Engine Light

• After repairs, reconnect the battery terminal and use the OBD-II scanner to clear the fault codes.
• Start the engine and allow it to run for a few minutes to check if the light returns.

5. Test Drive

• Perform a test drive under various conditions to ensure the issue is resolved and the check engine light does not re-illuminate.