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

Solution

1. Preparation

• Gather tools and parts. Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery's negative terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers, flashlight.
• Using a vacuum gauge, check for proper readings at the intake manifold.
• Visually inspect all vacuum hoses and intake gaskets for cracks or disconnections.
• Replace any damaged hoses or gaskets found during the inspection.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, torque wrench.
• Locate the MAF sensor in the air intake pathway.
• Disconnect the electrical connector and remove the MAF sensor from the housing.
• Spray the sensor with MAF cleaner and allow it to dry completely before reinstalling.
• Reinstall and reconnect the MAF sensor, ensuring it is securely fastened.

4. Verify Fuel Delivery

• Tools Required: Fuel pressure gauge, socket set.
• 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 for the correct fuel pressure (consult specifications for your model).
• If pressure is low, check the fuel pump and filter. Replace if necessary.

5. Replace Engine Coolant Temperature Sensor (if faulty)

• Tools Required: Socket set, torque wrench.
• Locate the engine coolant temperature sensor, usually near the thermostat housing.
• Disconnect the electrical connector and remove the sensor using a socket.
• Install the new sensor and reconnect the electrical connector, ensuring a proper seal.