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P0174

Overview

Code

P0174

Code Type

P

Code Class

P0

System

Engine, Emissions

Severity Level

Medium

Emissions Related

true

Drivability Impact

Major

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0174 indicates that the engine is running too lean on Bank 2

Symptoms

Check Engine Light illuminated; Hesitation; Rough idle

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

Lean mixtures on Bank 2 affect combustion balance and emissions

Possible Causes

Vacuum leaks; Faulty MAF sensor; Low fuel pressure

Diagnostic Steps

1 Review Bank 2 fuel trim data; 2 Inspect intake system; 3 Check MAF readings; 4 Measure fuel pressure

Drive Safety Notes

Prolonged lean operation may cause engine damage

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