why does my Ram 1500 DT (2019-Present) have a check engine light with P0171?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.

2. Inspect Air Intake System

• Remove the air intake duct to access the MAF sensor.
• Inspect the duct and hoses for any signs of cracks or disconnections.
• Clean or replace the MAF sensor as needed with MAF cleaner.

3. Check for Vacuum Leaks

• Use a smoke machine or carburetor cleaner to identify vacuum leaks around intake manifold gaskets and hoses.
• Repair or replace any damaged hoses or gaskets found during inspection.

4. Fuel System Inspection

• Test the fuel pressure with a fuel pressure gauge; ensure it meets manufacturer specifications.
• Replace the fuel filter if it is clogged or hasn’t been changed according to maintenance schedule.
• Inspect fuel injectors for proper operation; clean or replace if necessary.

5. Exhaust System Evaluation

• Visually inspect the exhaust system for any signs of blockage or damage.
• If necessary, perform a backpressure test to check for restrictions in the catalytic converter.

6. Reassemble and Reset

• Reinstall any components that were removed for inspection.
• Reconnect the battery.
• Use the OBD-II scanner to clear the P0171 code and reset the check engine light.