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P0173

Overview

Code

P0173

Code Type

P

Code Class

P0

System

Engine, Emissions

Severity Level

Medium

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0173 indicates a fuel trim malfunction on Bank 2 detected by the ECM

Symptoms

Check Engine Light illuminated; 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

Fuel trim adjustments on Bank 2 control air-fuel mixture balance

Possible Causes

Vacuum leaks; Oxygen sensor faults; Fuel system issues

Diagnostic Steps

1 Confirm the code; 2 Review Bank 2 fuel trim data; 3 Inspect intake system; 4 Test oxygen sensor function

Drive Safety Notes

Driving is possible but performance and emissions may be affected

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