how to fix P0171 lean condition code in my Toyota Tacoma N300 (2016-Present)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery to prevent electrical shorts.

2. Inspect and Clean MAF Sensor

• Remove the MAF sensor from the air intake duct.
• Use MAF sensor cleaner to spray the sensor element; do not touch it directly.
• Allow the sensor to dry completely before reinstalling.

3. Check for Vacuum Leaks

• Visually inspect all vacuum hoses and connections.
• Use a smoke machine or propane torch (with caution) around suspected areas to detect leaks.
• Replace any damaged hoses or seals.

4. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine to check the fuel pressure.
• Refer to the manufacturer specifications for the correct pressure range (typically 40-50 psi for Tacoma).
• If pressure is low, check the fuel pump and fuel filter for issues.

5. Replace Faulty Components

• If any components (e.g., MAF sensor, fuel filter, vacuum hoses) are found defective during inspection, replace them with OEM or quality aftermarket parts.
• Ensure all connections are tight and secure during reassembly.

6. Reassemble and Reset Codes

• Reinstall all components removed during the inspection.
• Reconnect the battery and use the OBD-II scanner to clear the trouble codes.