how to fix P0171 code in my Ram 1500 DT (2019-Present)

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the battery (negative terminal) to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner around the intake areas to identify leaks.
• Replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Remove the MAF sensor from the air intake duct.
• Use MAF cleaner spray to clean the sensor element carefully.
• If the sensor is faulty or damaged, replace it with a new one and reconnect it.

4. Check Fuel Pressure

• Locate the fuel pressure test port on the fuel rail.
• Attach a fuel pressure gauge and turn the ignition to the "on" position (do not start the engine).
• Record the pressure reading; it should match the specifications in the service manual (usually between 50-60 PSI).
• If the pressure is low, check the fuel pump and filter for issues and replace as necessary.

5. Inspect Fuel Injectors

• Remove the fuel injectors from the fuel rail.
• Check for clogs by visually inspecting them or using a fuel injector cleaning kit.
• Replace any malfunctioning injectors and reinstall them securely.

6. Reassemble and Reconnect

• Reattach all components removed during the inspection process.
• Reconnect the battery and ensure all connections are tight.