P0174 — System too lean (bank 2).

Code P0174 is a standard OBD-II diagnostic trouble code: System too lean (bank 2).

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite P0174 across 11 vehicle failure patterns. Diagnostic codes in complaints are reported by owners and are unverified — they point to where this code shows up, not a confirmed diagnosis. Open a page below for the full pattern (symptoms, mileage, repair costs owners cite).

Vehicles where owners report P0174 11 patterns

2020 Ford Escape

fuel system — Fuel-injector failure

2016 Subaru Legacy

electrical — Oil intrusion into electrical components (ECU and O2 sensors)

2015 Dodge Journey

electrical — Engine stall at highway speed with loss of steering, brakes, and throttle

2013 Chevrolet Traverse

powertrain — Sudden loss of power / limp mode activation

2013 GMC Terrain

electrical — Instrument Panel Electrical Shorts and Gauge/Warning Light Failure

2007 Chevrolet Silverado

powertrain — Electrical loss of power and instrument cluster failures

2007 Toyota RAV4

cruise control — Brake booster failure—loss of vacuum, soft pedal, inability to stop

2006 Ford Ranger

engine — Cylinder Head Exhaust Valve Seat Recession

2005 Ford F-150

engine — Engine stalling and loss of power (intermittent)

2005 Ford Ranger

engine — Engine stalling/shutdown—undiagnosed cause

2005 Jaguar S-Type

fuel system — Fuel tank leaking during and after refueling

Codes are pulled from what owners wrote in their NHTSA filings — they're allegations, not a shop diagnosis. Always confirm with a live scan. Browse all diagnostic codes →