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

Solution

1. Preparation

• Gather tools and parts necessary for repairs.
• Disconnect the battery to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, flashlight, hose clamps
• Visual inspection of all vacuum hoses connected to the intake manifold.
• Use a smoke machine or vacuum gauge to locate any leaks.
• Replace any damaged or disconnected hoses and tighten clamps as necessary.

3. Clean or Replace MAF Sensor

• Tools Required: Torx screwdriver, MAF cleaner
• Remove the MAF sensor from the air intake duct.
• Spray MAF cleaner on the sensor elements, ensuring not to touch them.
• Allow it to dry completely before reinstalling; if faulty, replace with a new sensor.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "ON" position without starting the engine and check the fuel pressure.
• If pressure is below specifications (usually around 58-60 psi), inspect the fuel pump and filter for issues.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit (if cleaning), replacement injectors (if faulty)
• Remove the fuel rail to access the injectors.
• Inspect each injector for proper seating and any signs of leaks.
• Clean injectors with a cleaning kit or replace them if they are clogged.

6. Throttle Body Cleaning

• Tools Required: Throttle body cleaner, soft cloth
• Remove the air intake duct to access the throttle body.
• Use throttle body cleaner to clean the inside of the throttle body.
• Wipe down with a soft cloth to remove carbon buildup.