how to fix P0171 code in Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the battery to ensure safety while working on the vehicle.

2. Inspect for Vacuum Leaks

• Tools Required: Vacuum gauge, smoke machine (if available)
• Visually inspect all vacuum hoses and connections for cracks or loose fittings.
• If available, use a smoke machine to detect leaks in the intake system.
• Repair or replace any damaged hoses or components.

3. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition key to the "ON" position (do not start the engine).
• Check the fuel pressure reading against manufacturer specifications (usually around 40-50 PSI for most models).
• If the pressure is low, inspect the fuel pump, filter, and lines for issues. Replace parts as necessary.

4. Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Disconnect the MAF sensor connector.
• Remove the MAF sensor from the air intake duct.
• Spray MAF sensor cleaner on the sensing elements; do not touch them.
• Allow the sensor to dry completely before reinstalling.

5. Inspect Fuel Injectors

• Tools Required: Multimeter (if testing resistance), injector cleaning kit (if cleaning)
• Check the electrical connectors to the fuel injectors for signs of corrosion.
• Use a multimeter to test the injector resistance; replace any injectors that are out of specification.
• If necessary, use an injector cleaning kit to clean clogged injectors.

6. Reassemble and Test

• Reinstall all components and ensure all connections are secure.
• Reconnect the battery.
• Start the engine and allow it to idle for a few minutes.