how to fix P0174 code on Ram 1500 DT (2019-Present)

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

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface.
• Disconnect the negative battery terminal to prevent electrical shocks.
• Gather tools and replacement parts needed for the repair.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Sub-steps:
  1. Remove the engine cover (if applicable) to gain access to the intake components.
  2. Inspect all intake hoses for cracks or loose connections, particularly on the intake manifold and throttle body.
  3. If any hoses are damaged, replace them with OEM parts.
  4. Check the intake manifold gasket for leaks; replace if necessary.

3. Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the sensor from the air intake duct.
  3. Spray the MAF sensor with the cleaner, ensuring not to touch the sensor wires.
  4. Allow it to dry completely before reinstalling.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition key to the "ON" position (do not start the engine) to check the pressure.
  3. Compare the reading to the manufacturer's specifications.
  4. If pressure is low, inspect the fuel pump and filter; replace as necessary.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket
• Sub-steps:
  1. Locate the bank 2 oxygen sensor.
  2. Disconnect the sensor’s electrical connector and remove it from the exhaust system.
  3. Inspect for contamination or damage; replace if necessary.
  4. Reinstall the new sensor and reconnect the electrical connector.

6. Reassemble and Test

• Reinstall any components removed during the inspection and repair process.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.