how to fix a check engine light P0174 in Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and safety equipment.
• Disconnect the vehicle battery to prevent electrical shorts.
• Ensure the engine is cool before proceeding with repairs.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, flashlight
• Remove the engine cover if applicable.
• Inspect the intake hose and connections for cracks or loose fittings.
• Tighten any loose clamps or replace damaged hoses.
• If any components are damaged, replace them.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, small screwdriver
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the intake tube.
• Spray MAF sensor cleaner onto the sensor, avoiding contact with other components.
• Allow the sensor to dry completely before reinstallation.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and start the engine.
• Observe the pressure reading; it should meet manufacturer specifications (usually around 50-60 psi for most models).
• If the pressure is low, inspect the fuel pump and filter for issues.

5. Inspect Fuel Injectors

• Tools Required: Noid light or multimeter
• Disconnect the fuel injector connectors.
• Connect a noid light to the injector's connector to check for pulse.
• If no pulse is detected, check wiring and the engine control unit (ECU).
• If injectors are clogged, consider using a fuel injector cleaner or replacing them if necessary.