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P0170

Overview

Code

P0170

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 P0170 indicates a fuel trim malfunction on Bank 1 detected by the ECM

Symptoms

Check Engine Light illuminated; Poor fuel economy; 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 control uses oxygen sensor feedback to adjust air-fuel mixture for optimal combustion and emissions

Possible Causes

Vacuum leaks; Faulty oxygen sensor; Fuel delivery issues

Diagnostic Steps

1 Confirm the code; 2 Check fuel trim data (STFT/LTFT); 3 Inspect for vacuum leaks; 4 Verify O2 sensor operation; 5 Diagnose fuel system issues

Drive Safety Notes

Driving is possible, but fuel efficiency and emissions will be affected

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