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

Solution

1. Preparation

• Gather all necessary tools and parts before beginning repairs.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect Air Intake System

• Tools Required: Screwdriver, flashlight, vacuum gauge
• Check for any visible cracks or disconnections in the air intake hoses.
• Use a vacuum gauge to test for leaks; replace any damaged hoses.

3. Clean MAF Sensor

• Tools Required: MAF sensor cleaner, soft cloth
• Remove the MAF sensor from the air intake duct.
• Spray the MAF sensor with MAF cleaner and let it dry completely before reinstalling.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start) and observe the pressure reading. It should meet the manufacturer specifications (typically around 40-50 psi).
• If the pressure is low, consider replacing the fuel pump or checking the fuel filter.

5. Inspect Fuel Injectors

• Tools Required: Multimeter, injector cleaner
• Check the resistance of the fuel injectors using a multimeter (specifications are usually around 12-16 ohms).
• If they are out of range, replace them. If within range, use an injector cleaner to clear any clogs.

6. Clean Throttle Body

• Tools Required: Throttle body cleaner, soft brush
• Remove the throttle body and clean it with throttle body cleaner and a soft brush to remove any carbon buildup.
• Reinstall the throttle body and reconnect all hoses and electrical connectors.