how to deal with P0171 code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers
• Visually inspect all vacuum lines and intake manifold gaskets for cracks or wear.
• Use a vacuum gauge to check for leaks in the intake manifold.
• Replace any damaged vacuum hoses and gaskets.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, screwdriver
• Remove the MAF sensor from the air intake duct.
• Spray MAF cleaner on the sensor and allow it to dry completely.
• Reinstall the MAF sensor, ensuring it is properly seated and secured.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge to the test port.
• Turn the ignition to the "ON" position (do not start the engine) and check the pressure against the manufacturer's specifications (typically around 40-50 psi).
• If pressure is low, inspect the fuel pump and filter for issues and replace as needed.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner kit, socket set
• Remove the fuel injectors from the fuel rail.
• Use a fuel injector cleaner kit to clean the injectors or replace them if they are clogged.
• Reinstall the injectors and ensure they are properly seated.

6. Replace Engine Coolant Temperature Sensor (if needed)

• Tools Required: Socket set, coolant
• Locate the engine coolant temperature sensor and disconnect the wiring harness.
• Remove the sensor and replace it with a new one, using thread sealant if necessary.
• Reconnect the wiring harness and refill any lost coolant.