Repair cost
$90–$300
DIY from $15
DIY difficulty
Easy
If you do it yourself
Urgency
Within a month
Before bigger damage
Common symptoms
- Check engine light on
- Minor hesitation in some cases
- Slightly off fuel economy
- Often no noticeable symptoms
Common causes, ranked by likelihood
Based on typical diagnoses for P0113. Work from the most likely cause down before replacing expensive parts.
Faulty IAT sensor 40%
Open or corroded wiring / connector 35%
Dirty sensor (often built into the MAF) 15%
Poor ground or PCM issue 10%
How to diagnose it
- Locate the IAT sensor (often integrated into the MAF sensor) and inspect its connector for damage or corrosion.
- Check the signal and ground wires for an open circuit.
- Compare the sensor's reading to ambient temperature with a scan tool at a cold start.
- Replace the sensor or MAF assembly if the reading is implausible.
DIY vs shop cost
Shop
$90–$300
Parts + labour at an independent shop.
DIY can save up to $30
Make-specific notes
Volkswagen
On many VW/Audi engines the IAT is part of the MAF sensor, so the MAF assembly is replaced to fix it.
P0113 questions, answered
Is P0113 serious?
No, it's a minor sensor fault that's safe to drive with. Fuel trims may be slightly off, but it rarely affects drivability. Fix it to clear the light.
Where is the IAT sensor?
It's usually in the intake duct or built into the mass airflow sensor. On many cars, replacing the MAF assembly also replaces the IAT sensor.