OBD-II Code P0113 — What It Means & How to Fix It

What Does This Error Mean?

P0113 means the intake air temperature (IAT) sensor is reading an unusually high voltage. This sensor measures the temperature of the air entering your engine. A high input signal tells the computer that the incoming air is extremely cold — even when it's not. This causes the engine to add too much fuel, which wastes gas and can foul spark plugs. The good news is this is usually a simple wiring or sensor problem that's easy to fix.

Affected Models

All vehicles 1996+
Common in Ford Ranger
Common in Chevrolet Tahoe
Common in Toyota Tacoma
Common in Honda CR-V

Common Causes

Disconnected or loose wiring connector at the IAT sensor
Broken or corroded wires in the IAT sensor circuit
Failed IAT sensor giving incorrect voltage readings
Open circuit between the IAT sensor and the engine computer
Water or corrosion damage inside the IAT sensor connector

How to Fix It

Locate the IAT sensor. On many vehicles, it's built into the MAF sensor in the air intake duct. On others, it's a separate sensor screwed into the air intake tube or intake manifold.

Check your vehicle's service manual or search online for the exact location on your specific model.
Check the electrical connector at the IAT sensor. Unplug it and inspect for corrosion, bent pins, water damage, or loose fit. Clean the contacts with electrical contact cleaner.

A disconnected plug is the most common cause of P0113. Sometimes it vibrates loose over time.
Inspect the wiring between the IAT sensor and the engine computer. Look for chafed, broken, or rodent-chewed wires along the harness.

Follow the wire from the sensor toward the firewall. Pay special attention where wires pass near hot exhaust components.
If the connector and wiring look good, replace the IAT sensor itself. These sensors are inexpensive and easy to swap out.

An IAT sensor costs $10-$40 at most auto parts stores. If it's built into the MAF sensor, you'll need to replace the whole MAF unit.
Clear the code with an OBD-II scanner and start the engine. Monitor the IAT sensor reading — it should show a temperature close to the actual ambient temperature outside.

If the reading shows -40°F or an unrealistic number, the sensor or wiring is still faulty.

When to Call a Professional

This is usually a straightforward fix that most people can handle at home. But if you've replaced the sensor and checked all wiring without success, a mechanic can help. They can trace the wiring back to the engine computer for hidden breaks. Expect to pay $60-$120 for diagnosis. Sensor replacement at a shop is typically $80-$200 total.

Frequently Asked Questions

What does the IAT sensor do?

It measures the temperature of the air entering your engine. Cold air is denser and needs more fuel. Warm air is thinner and needs less fuel. The computer uses this reading to fine-tune the fuel mixture. Without accurate readings, your engine wastes fuel.

Is P0113 serious?

No, P0113 is generally a minor issue. Your car will still run and is safe to drive. You may notice slightly worse fuel economy. The engine might run a little rough in some conditions. But there's no risk of engine damage from this code alone.

Can cold weather trigger P0113?

Not usually — the code means a sensor circuit problem, not actual cold air. However, extreme cold can make brittle wiring crack or connectors contract. If P0113 only appears in winter, check for a marginal wire connection. The cold may be causing an intermittent open circuit that works fine when warm.