what does a P0171 code mean for my Toyota RAV4 XA40 (2013-2018)?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set, vacuum gauge
• Check all hoses, clamps, and connections for leaks.
• Replace any damaged or loose components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver set
• Remove the MAF sensor from the air intake duct.
• Spray MAF sensor cleaner on the sensor wire and allow it to dry completely before reinstalling.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge, wrench set
• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and check the fuel pressure against the specifications (typically between 43-50 psi).
• If pressure is low, inspect the fuel pump and filter and replace as necessary.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set
• Check the upstream oxygen sensor for proper operation using a multimeter.
• If faulty, replace the oxygen sensor and clear the fault codes.