my Toyota RAV4 Fifth Generation (2019-present) has a check engine light with P0174 what should I do

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Remove the engine cover if applicable.
  • Inspect the air intake duct for cracks or loose fittings; replace any damaged components.
  • Ensure the air filter is clean and properly installed; replace if dirty.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor, typically found in the air intake duct.
  • Disconnect the MAF sensor electrical connector.
  • Remove the MAF sensor from the duct (usually secured with screws or clips).
  • Clean the sensor with MAF cleaner; do not touch the sensor element.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Repair Vacuum Leaks

• Sub-steps:
  • Inspect all vacuum lines connected to the intake manifold; replace any cracked or damaged hoses.
  • Use a smoke machine or carburetor cleaner to detect any leaks around the intake manifold gasket.

5. Fuel System Inspection

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail test port.
  • Turn the ignition on (do not start the engine) and check fuel pressure against manufacturer specifications.
  • If the pressure is low, inspect the fuel pump and filter; replace if necessary.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the codes and reset the check engine light.