my Ram 1500 DT (2019-Present) has a P0174 code, what does that mean?

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers
• Use a vacuum gauge to test for leaks in the intake system.
• Inspect all vacuum hoses and connections for cracks or disconnections.
• Replace any damaged hoses or tighten loose connections.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Remove the MAF sensor from the intake manifold.
• Spray the MAF sensor with MAF cleaner to remove dirt and debris.
• Allow the sensor to dry completely before reinstalling it.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and attach the fuel pressure gauge.
• Turn the ignition to the "On" position (do not start) and check the pressure reading against manufacturer specifications.
• If the pressure is low, check the fuel pump, filter, and injectors for issues.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter
• Use the O2 sensor socket to remove the oxygen sensor on Bank 2.
• Test the sensor with a multimeter to check for proper voltage and resistance.
• Replace the sensor if it is outside of the manufacturer’s specifications.

6. Replace ECT Sensor (if necessary)

• Tools Required: Ratchet and socket set
• Disconnect the electrical connector from the ECT sensor.
• Remove the sensor from its location using the ratchet and socket.
• Install the new sensor and reconnect the electrical connector.