OBD-II Error Code P0112: How to Fix IAT Sensor Low Input

Easy 30-60 minutes Medium Severity Verified June 2026
Summarize with ChatGPTSummarize with ClaudeSummarize with Perplexity Add as Preferred Source on Google
Error Code
P0112
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
30-60 minutes
Error code P0112 means your vehicle's Intake Air Temperature (IAT) sensor is reporting a voltage lower than expected. This usually indicates a short to ground, a faulty sensor, or wiring issues. The engine computer uses IAT data to adjust fuel mixture, so this code can affect performance and fuel economy.
Ad

Tools You'll Need

How to Fix Error Code P0112

  1. Safety First

    Always disconnect the battery before working on electrical components.

  2. Locate the IAT Sensor

  3. Visually Inspect Wiring and Connector

  4. Test the IAT Sensor with a Multimeter

    Do not probe the sensor with the ignition on. Use the Ohm setting with the sensor disconnected.

  5. Check Voltage at the Connector

    Use caution when probing live circuits. Do not short pins together.

  6. Replace IAT Sensor (If Faulty)

    Ensure the replacement sensor matches your vehicle's specifications.

  7. Clear the Error Code and Test

Parts You May Need

Intake Air Temperature (IAT) Sensor
Check Price on Amazon
Intake Air Temperature (IAT) Sensor
Check Price on Amazon
Intake Air Temperature (IAT) Sensor
Check Price on Amazon
Intake Air Temperature (IAT) Sensor
Check Price on Amazon
Ad

When to Call a Professional

If you've replaced the sensor and still see code P0112, or if you find damaged wiring that's difficult to repair, consult a certified mechanic. A professional can diagnose ECU issues or complex wiring faults.

Frequently Asked Questions

Can I drive with error code P0112?
Yes, but the engine may run rich or poor, reducing fuel economy and performance. It's best to fix it promptly.
What causes P0112?
Common causes include a faulty IAT sensor, a short to ground in the wiring, or a poor electrical connection.
How much does it cost to fix P0112?
DIY cost is about $20-50 for a replacement sensor. Shop labor adds $100-200.
Is P0112 the same as P0113?
No. P0112 indicates a low input (signal voltage too low), while P0113 indicates a high input (signal voltage too high).
Will clearing the code permanently fix it?
Only if the underlying issue is resolved. If the problem persists, the code will return.

Related Error Codes