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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Repair Air Intake System

1. Inspect Hoses: Check all vacuum hoses connected to the intake manifold for cracks or disconnections.
   • Tools Required: Visual inspection.
2. Repair or Replace Hoses: Replace any damaged hoses with OEM parts.

3. Clean or Replace MAF Sensor

1. Remove MAF Sensor: Disconnect the electrical connector and unscrew the MAF sensor from the air intake.
   • Tools Required: Screwdriver set.
2. Clean Sensor: Use MAF sensor cleaner to spray the sensor and let it dry.
3. Reinstall MAF Sensor: Reattach the sensor and electrical connector securely.

4. Check Fuel Pressure

1. Connect Fuel Pressure Gauge: Locate the fuel rail and connect the gauge to the Schrader valve.
   • Tools Required: Fuel pressure gauge.
2. Start Engine: Turn the ignition to the ON position without starting to check the fuel pressure.
3. Record Pressure: Ensure the pressure is within manufacturer specifications (typically between 40-50 psi).
4. Replace Fuel Pump or Filter: If pressure is low, replace the fuel pump or the fuel filter as necessary.

5. Inspect Fuel Injectors

1. Remove Fuel Rail: Disconnect the fuel rail from the intake manifold.
   • Tools Required: Socket set.
2. Inspect Injectors: Check each injector for clogs or leaks. Clean or replace as needed.
3. Reinstall Fuel Rail: Ensure all connections are secure and reattach the fuel rail.

6. Verify Engine Coolant Temperature Sensor

1. Locate Sensor: Find the engine coolant temperature sensor near the thermostat housing.
2. Test Sensor: Use a multimeter to check the resistance; compare readings with specifications.
   • Tools Required: Multimeter.
3. Replace Sensor: If the sensor is faulty, replace it with a new one.