why is my Toyota Camry XV40 (2007-2011) check engine light on after oil change

Solution

1. Preparation

• Gather necessary tools: OBD-II scanner, socket set, oil filter wrench, and rags.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Retrieve Diagnostic Codes

• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Turn the ignition to the "ON" position without starting the engine.
• Follow the scanner instructions to read and record any error codes.

3. Inspect Oil Level and Filter

• Remove the dipstick and check the oil level; add oil if it is low or drain excess if overfilled.
• Using the oil filter wrench, check the oil filter for proper tightness; replace if the seal is damaged.

4. Verify Oil Type

• Consult the owner’s manual to confirm the correct oil type (e.g., 0W-20 or 5W-30) and viscosity.
• If incorrect oil was used, drain the oil and replace with the correct type.

5. Inspect Sensors and Wiring

• Visually inspect the wiring harness for any loose or damaged connections.
• Check the oil pressure sensor for proper function; replace if faulty.