how to fix the P0171 code on my Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Vacuum Leaks

• Visually inspect vacuum hoses and connections for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to identify leaks. If leaks are found, replace the damaged hoses or seals.

3. Clean the Mass Air Flow (MAF) Sensor

• Remove the MAF sensor from the intake duct using a Torx screwdriver.
• Spray MAF sensor cleaner on the sensor element and allow it to dry completely before reinstalling.
• Reinstall the MAF sensor and ensure all connections are secure.

4. Test and Replace Fuel Filter (if necessary)

• Locate the fuel filter and disconnect the fuel lines using a line wrench to prevent damage.
• Replace the fuel filter with a new one according to manufacturer specifications.
• Reconnect the fuel lines and ensure there are no leaks.

5. Check and Clean Fuel Injectors

• Remove the fuel injectors from the fuel rail following the manufacturer’s guidelines.
• Use a fuel injector cleaning kit to clean the injectors thoroughly.
• Inspect the injector O-rings for damage and replace them if necessary before reinstalling.

6. Check Throttle Position Sensor (TPS)

• Disconnect the TPS connector and use a multimeter to check for proper voltage output while actuating the throttle.
• If the readings are outside specifications, replace the TPS with a new unit.