P0113 Code – Intake Air Temperature Sensor High Input

The P0113 OBD2 code indicates that the Engine Control Unit (ECU) has detected a high voltage signal from the Intake Air Temperature (IAT) sensor.

The IAT sensor measures the temperature of the air entering the engine. This information is critical for calculating:

• air density

• fuel injection timing

• ignition timing

A high input signal usually means the ECU interprets the air as extremely cold, which is often caused by an open circuit or disconnected sensor.

Symptoms of Code P0113

Common symptoms include:

• Check Engine Light ON

• Hard starting (especially cold starts)

• Increased fuel consumption

• Rough idle

• Poor engine performance

• Black smoke (rich fuel mixture)

In some cases, the engine may run in default/fail-safe mode.

Common Causes of P0113

Typical causes include:

• Disconnected IAT sensor

• Broken or damaged wiring

• Open circuit in sensor wiring

• Faulty IAT sensor

• Corroded connectors

• ECU reading error (rare)

Because this code often indicates no signal, wiring issues are very common.

How Serious Is Code P0113

The P0113 code is considered low to moderate severity.

The car is usually still drivable, but:

• fuel consumption increases

• engine efficiency drops

• emissions worsen

It should be fixed to restore proper engine operation.

How to Diagnose Code P0113

Diagnosis steps:

1. Scan vehicle with OBD2 scanner

2. Check live data for IAT readings

3. Inspect IAT sensor connector

4. Check wiring for breaks or disconnections

5. Measure voltage and resistance with a multimeter

6. Compare readings with manufacturer specs

A very common finding: sensor unplugged or wire broken.

How to Fix Code P0113

Possible solutions:

• reconnect the IAT sensor

• repair broken wiring

• clean electrical connectors

• replace faulty IAT sensor

• clear code after repair

In most cases, the fix is simple and inexpensive.

Vehicles Commonly Affected

This code can appear on most vehicles, including:

• Volkswagen

• BMW

• Ford

• Opel

• Toyota

• Audi

• Mercedes-Benz

Any engine using an IAT sensor can trigger this code.

FAQ – P0113 Code

Can I drive with code P0113?

Yes, but performance and fuel efficiency will be affected.

What does high input mean?

It means the ECU receives too much voltage, usually due to an open circuit.

Is P0113 easy to fix?

Yes. Most cases involve simple wiring or sensor issues.