how to fix P0174 lean code in my Ram 1500 DT (2019-Present)?

Learn how to diagnose and fix P0174 lean code in Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery's negative terminal to ensure safety.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge.
• Inspect the intake manifold gasket for signs of wear or damage.
• If damaged, remove the intake manifold by:
  1. Disconnecting air intake hoses and electrical connectors.
  2. Unbolting the manifold and carefully lifting it off.
  3. Cleaning the mating surfaces.
  4. Installing a new gasket and reattaching the manifold.
• Reconnect all hoses and components securely.

3. Check and Replace Fuel Pump if Necessary

• Tools Required: Fuel pressure gauge, socket set.
• Connect a fuel pressure gauge to the fuel rail to measure pressure.
• If pressure is below specifications, replace the fuel pump:
  1. Relieve fuel system pressure by removing the fuel pump relay and starting the engine until it stalls.
  2. Disconnect the battery and remove the fuel lines from the pump assembly.
  3. Unbolt the fuel pump assembly and replace it with a new one.
  4. Reconnect all lines and the battery.

4. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver.
• Remove the MAF sensor from the air intake tube.
• Use MAF cleaner to clean the sensor element carefully.
• If cleaning does not resolve the issue, replace the MAF sensor with a new one.

5. Inspect and Replace Oxygen Sensors

• Tools Required: Oxygen sensor socket, wrench set.
• Locate the oxygen sensors on the exhaust system.
• Inspect for damage or contamination.
• If necessary, replace the oxygen sensors:
  1. Disconnect the electrical connector.
  2. Use an oxygen sensor socket to remove the sensor.
  3. Install the new sensor and reconnect the electrical connector.