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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect for Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers
• Visually inspect all vacuum lines and gaskets for signs of wear or damage.
• Use a vacuum gauge to check for any irregular readings that indicate a leak.
• If leaks are found, replace the damaged hoses or gaskets.

3. Fuel System Inspection

• Tools Required: Fuel pressure gauge
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition key to the "On" position without starting the engine.
• Check that the fuel pressure is within the manufacturer's specifications (usually between 50-60 PSI for most models).
• If pressure is low, inspect the fuel pump, fuel filter, and fuel lines for blockages or failures.

4. MAF Sensor Cleaning

• Tools Required: MAF sensor cleaner
• Disconnect the MAF sensor connector and remove the sensor from the air intake duct.
• Spray MAF sensor cleaner onto the sensing elements (do not touch them).
• Allow the sensor to dry completely before reinstalling it.

5. Fuel Injector Check

• Tools Required: Injector cleaning kit (optional)
• Remove the fuel injectors from the fuel rail.
• Inspect them for clogs or damage; clean them using an injector cleaning kit if necessary.
• Reinstall the injectors ensuring they are properly seated.

6. Oxygen Sensor Verification

• Tools Required: OBD-II scanner
• Use the OBD-II scanner to monitor the oxygen sensor readings.
• If the oxygen sensors are showing incorrect voltage or are sluggish, replace them as necessary.