1997 Mustang 3.8L Engine Code P0174: Diagnosis and Troubleshooting Guide

What should I check first when my 1997 Mustang with a 3.8L engine is displaying the P0174 diagnostic trouble code? The P0174 code indicates a lean condition in cylinder 4 of the intake system, which can be caused by issues such as faulty oxygen sensors, vacuum leaks, or clogged fuel injectors. To address this effectively, start by inspecting the intake manifold for cracks or leaks, verifying the integrity of the oxygen sensor, and checking for any signs of carbon buildup on the throttle body. Ensure all connections are secure and that the engine is properly calibrated. Refer to official service manuals or OBD-II diagnostic tools for accurate readings.