why does my Toyota RAV4 Fifth Generation (2019-present) check engine light keep coming on

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, multimeter, various wrenches.
• Disconnect the battery to ensure safety while working on electrical components.

2. Address Fault Codes

• Use the OBD-II scanner to retrieve trouble codes.
• Research each code to determine the specific issue (e.g., P0420 for catalytic converter efficiency, P0171 for a lean fuel mixture).
• If codes indicate a faulty sensor, proceed to replace it.

3. Gas Cap Inspection and Replacement

• Inspect the gas cap for cracks or wear.
• Clean the gas cap and sealing surface on the fuel filler neck.
• If damaged, replace the gas cap with a new one, ensuring a tight fit.

4. Air Filter Replacement

• Locate the air intake housing and remove the screws or clamps securing it.
• Remove the old air filter and inspect for dirt or blockages.
• Install a new air filter, ensuring it fits snugly in the housing.

5. Exhaust System Check

• Visually inspect the exhaust pipes, muffler, and catalytic converter for any signs of rust or damage.
• Tighten loose connections or replace damaged sections of the exhaust system as necessary.

6. Battery and Electrical System Check

• With the multimeter, check the battery voltage (should be around 12.6 volts when fully charged).
• Inspect battery terminals for corrosion; clean or replace as needed to ensure good connections.