how to resolve the P0171 code in my Toyota Camry XV70 (2018-2024)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to detect leaks around the intake manifold and vacuum lines.
• Replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Disconnect the MAF sensor connector.
• Remove the MAF sensor from the air intake housing using a screwdriver or socket.
• Clean the sensor with MAF cleaner spray; do not touch the sensing elements.
• If cleaning does not yield results, replace the MAF sensor with a new one.

4. Check Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the ON position (do not start the engine) and check the pressure reading.
• If pressure is below specification (usually around 40-55 psi), inspect the fuel pump and filter; replace as necessary.

5. Inspect Fuel Injectors

• If fuel pressure is adequate, check the fuel injectors for proper operation.
• Remove the injector connectors and perform a resistance test with a multimeter; replace any faulty injectors.
• Clean the injectors using an ultrasonic cleaner or replace them if they are clogged.

6. Reassemble and Test

• Reconnect any components removed during the inspection and repairs.
• Reconnect the battery.
• Clear the codes using the OBD-II scanner.
• Start the engine and observe for any abnormalities.