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P0691

Overview

Code

P0691

Code Type

P

Code Class

P0

System

Engine

Severity Level

Medium

Emissions Related

true

Drivability Impact

Major

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0691 indicates a malfunction in the intake air temperature sensor performance

Symptoms

Poor engine performance Check Engine Light

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

Intake air temperature sensor

Possible Causes

Faulty intake air temperature sensor Poor sensor calibration

Diagnostic Steps

1 Inspect air intake system 2 Test sensor calibration

Drive Safety Notes

Performance issues can lead to higher emissions and reduced efficiency

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