how to troubleshoot the P0171 code in my Toyota Tacoma N300 (2016-Present)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Screwdriver set, vacuum gauge, smoke machine (if available)
• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a vacuum gauge to check for abnormal readings that might indicate leaks.
• If found, replace damaged hoses or reattach loose connections.

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 onto the sensor elements and allow it to dry completely.
• Reinstall the MAF sensor and ensure all connections are secure.

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 manufacturer specifications (typically around 50-70 psi).
• If the pressure is low, check the fuel pump and filter. Replace if necessary.

5. Inspect Fuel Injectors

• Tools Required: Multimeter, injector cleaner
• Test each injector for resistance using a multimeter; compare with manufacturer's specifications.
• If injectors are clogged, use injector cleaner or replace faulty injectors.