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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety during repair.
• Allow the engine to cool down before starting the work.

2. Inspect and Repair Air Intake System

• Inspect for Leaks: Visually check all hoses and gaskets for cracks or disconnections.
  • Tools Required: Flashlight, inspection mirror
• Repair or Replace: If leaks are found, replace the damaged hoses or gaskets.

3. Check and Clean MAF Sensor

• Remove MAF Sensor: Disconnect the electrical connector and unscrew the MAF sensor from the air intake.
  • Tools Required: Torx or socket set
• Clean the Sensor: Use a MAF sensor cleaner to spray the sensor element. Avoid touching the sensor with fingers or tools.
• Reinstall the MAF Sensor: Secure it back in place and reconnect the electrical connector.

4. Test Fuel Pressure

• Connect Fuel Pressure Gauge: Locate the fuel rail and attach the fuel pressure gauge to the test port.
  • Tools Required: Fuel pressure gauge
• Check Fuel Pressure: Turn the ignition to the ON position without starting the engine. Compare the reading to manufacturer specifications (typically around 50-60 psi for most models).
• Replace Fuel Pump/Filter: If the pressure is low, inspect and replace the fuel pump or filter as necessary.

5. Inspect Fuel Injectors

• Remove Fuel Injectors: Disconnect the fuel rail and remove the injectors for inspection.
  • Tools Required: Socket set, fuel injector puller (if needed)
• Clean or Replace Injectors: Use an ultrasonic cleaner for cleaning; replace any that are damaged or clogged.

6. Recheck Oxygen Sensors

• Inspect Oxygen Sensors: Check wiring and connections for the upstream and downstream oxygen sensors.
• Replace if Necessary: If sensors are faulty, replace them according to manufacturer specifications.