Dec 31, 2025 · The P0174 code indicates a lean fuel condition on bank 2 of the engine, which can lead to poor fuel economy, rough idling, and engine damage. Vacuum leaks, faulty oxygen sensors, …

Feb 12, 2023 · How to diagnose the P0174 code easily. Find the meaning, symptoms, and the most common causes of the P0174 code - Full professional diagnostic guide.

P0174 means System Too Lean (Bank 2). Learn symptoms, common causes, how to diagnose fuel trims, and proven fixes for vacuum leaks, MAF, and fuel issues.

Jan 24, 2026 · P0174 code gets triggered when the Engine Control Module receives an input signal from the oxygen sensor —also called the air-fuel ratio sensor —indicating that the air/fuel mixture has …

Sep 12, 2025 · Is your car showing a P0174 code after scanning your check engine light? This code points to too much air in the engine, causing your car to run lean as opposed to running rich. In this …

The P0174 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0174 is set in along with the P0171 code, it is highly likely that the …

Feb 13, 2026 · Learn what the P0174 code means, why bank 2 is running lean, common symptoms and causes, how serious it is, and what to check to fix it.

Aug 27, 2024 · Code P0174 means the engine’s Bank 2 is running too lean, with too much air or insufficient fuel in the air-fuel mixture. Several issues can trigger a P0174 code, including vacuum …

Basically this P0174 code means that the upstream oxygen sensor in bank 2 reporting a lean condition (too much oxygen in the exhaust). On V6/V8/V10/V12 engines, Bank 2 is the side of the engine that …

Jan 9, 2026 · Code P0174 specifically stands for “System Too Lean (Bank 2),” which signals that the engine control module (ECM) has detected an air-fuel mixture containing too much air or not enough …