P0174 Code: System Too Lean (Bank 2) — Causes, Fuel Trim Guide
P0174 means the PCM has detected a lean air/fuel mixture on Bank 2 — the exhaust side of the engine that does not contain cylinder 1. The causes and diagnosis are identical to P0171 but localised to the …
P0174 – System Too Lean (Bank 2) - Mechanic Base
Feb 12, 2023 · Here is everything you need to know about the P0174 code. P0174 – System Too Lean (Bank 2) Still unsure what’s wrong with your car? Ask a mechanic now. What does the P0174 Code …
P0174 Code Meaning, Causes, Symptoms & Tech Notes
The P0174 code indicates that the fuel trim system on bank 2 of the engine is detecting a lean condition. Common causes include Vacuum leaks, Faulty oxygen sensor, Clogged fuel injectors. Severity is …
P0174 Code? Here’s How to Fix It – Quickly and Easily
Dec 31, 2025 · When your car’s onboard computer stores a P0174 code, it’s indicating a problem with the fuel trim system on bank 2 of the engine. This code signals a lean condition, meaning there’s an …
P0174 Code Explained: System too Lean (Bank 2) – Causes & Fixes
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 been running …
P0171 & P0174 Trouble Codes - Diagnosis, Causes, Symptoms ... - AutoZone
When your powertrain/engine control module receives a reading that indicates there’s too much oxygen and the ratio is incorrect, it sends an error code P0171 or P0174. Depending on the problem, it may …
P0174 Code: System Too Lean (Cylinder Bank 2) Meaning, …
The P0174 diagnostic trouble code means the engine computer has detected a lean air-fuel mixture on cylinder bank 2. In simple terms, there is too much air and not enough fuel reaching that side of the …
OBD-II Trouble Code: P0174 System Too Lean (Bank 2)
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 …
Top Causes of the P0171 Code and P0174 Code - Rick's Free Auto …
Jan 6, 2018 · When I diagnose P0171 and P0174, it’s critical to understand how these codes are set in the first place so you don’t replace perfectly good parts. I walk you through what these codes mean, …
P0174 Code: Air-Fuel Ratio Too Lean (Symptoms, Causes, and Fixes)
May 29, 2026 · 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 …