P009A

Intake Air Temperature/Ambient Air Temperature Correlation

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–111 (est.)

Symptoms

Reduced engine power
Increased fuel consumption
Unstable idling
Check Engine Light Illuminates

Causes

Intake Air Temperature (IAT) Sensor Malfunction
Ambient Temperature Sensor (ATS) malfunction
Damaged or corroded sensor wiring harness
Air leaks in the intake tract
Sensor grounding problems
Engine control unit (ECU) malfunction

How to Fix

Check IAT and ATS sensor readings using a diagnostic scanner
Inspect the wiring harness and sensor connectors for damage.
Check the tightness of the intake tract
If necessary, replace faulty sensors
Clean or repair damaged connections
Test the operation of the system after repair

Related codes

P0112 P0113 P0116 P0117