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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent any electrical shorts.

2. Inspect Air Intake System

• Check all intake hoses and connections for cracks or disconnections.
• Tighten any loose clamps and replace damaged hoses.
• Tools Required: Screwdriver, pliers.

3. Clean or Replace MAF Sensor

• Remove the MAF sensor from the air intake duct.
• Use MAF sensor cleaner to clean the sensor element gently.
• If the sensor is faulty, replace it with a new one.
• Tools Required: Torx screwdriver or socket set, MAF sensor cleaner.

4. Test Fuel System Pressure

• Connect a fuel pressure gauge to the fuel rail service port.
• Turn the ignition to the 'On' position without starting the engine and check the pressure reading. It should be within the manufacturer's specifications (usually around 40-50 psi).
• If the pressure is low, check the fuel pump and filter for issues.
• Tools Required: Fuel pressure gauge.

5. Inspect Oxygen Sensor

• Locate the upstream oxygen sensor on the exhaust manifold.
• Check the wiring harness for damage or corrosion.
• Use a multimeter to test the sensor's voltage output while the engine is running.
• Replace the sensor if it is not functioning correctly.
• Tools Required: Wrench set, multimeter.

6. Reassemble and Reconnect

• Reinstall any components that were removed during the inspection.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.