AutoCodes – Scion – P0112 Scion

P0112 Scion Code - Intake Air Temperature Circuit Low Input

Quick Answer

The Intake Air Temperature (IAT), mounted on the Mass Air Flow meter sub-assembly, monitors the intake air temperature. Common causes include Dirty air filter, Faulty Intake Air Temperature (IAT) Sensor (Part of the Mass Air Flow [MAF] Sensor), Intake Air Temperature sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0112 Scion indicates Intake Air Temperature Circuit Low Input.
Common causes: Common causes include Dirty air filter, Faulty Intake Air Temperature (IAT) Sensor (Part of the Mass Air Flow [MAF] Sensor), Intake Air Temperature sensor harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,056

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 22, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0112 Scion Description

The Intake Air Temperature (IAT), mounted on the Mass Air Flow meter sub-assembly, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the Engine Control Module (ECM) as voltage changes.
The ECM monitors the sensor voltage and uses this value to calculate the intake air temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the intake air temperature sensor circuit and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0112 Scion - Intake Air Temperature Circuit Low Input - AutoCodes.com — P0112 Scion Code - Intake Air Temperature Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0112 Scion?

Dirty air filter
Faulty Intake Air Temperature (IAT) Sensor (Part of the Mass Air Flow [MAF] Sensor)
Intake Air Temperature sensor harness is open or shorted
Intake Air Temperature sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0112 Scion?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0112 Scion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0112 Scion code?

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Information for Specific Scion Models

P0112 2005 Scion xB — Intake Air Temperature Circuit Low Input
P0112 2006 Scion xB — Intake Air Temperature Circuit Low Input
P0112 2007 Scion xB — Intake Air Temperature Circuit Low Input

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0112 Scion Code

What does the OBDII code P0112 mean for a Scion?

P0112 indicates that the Intake Air Temperature (IAT) sensor is reporting a voltage that is lower than expected, suggesting a possible circuit issue or sensor fault.

What are the common symptoms of P0112 in a Scion?

Symptoms may include poor engine performance, reduced fuel efficiency, rough idling, and difficulty starting the engine.

What causes the P0112 code in a Scion?

Common causes include a faulty IAT sensor, damaged wiring or connectors, a short circuit, or a sensor contaminated with dirt or debris.

Can a dirty air filter trigger the P0112 code?

Yes, a clogged or dirty air filter can affect airflow and potentially contribute to an incorrect IAT sensor reading.

How do you diagnose the P0112 code on a Scion?

Inspect the IAT sensor, wiring, and connectors for damage or corrosion. Use a multimeter to check sensor resistance and voltage readings against manufacturer specifications.

Can you drive with the P0112 code active?

Driving with P0112 is possible but not recommended as it may lead to reduced engine performance and long-term damage.

How do you fix the P0112 code on a Scion?

Common fixes include replacing the IAT sensor, repairing damaged wiring or connectors, cleaning the sensor, or replacing the air filter.

Does P0112 affect emissions in a Scion?

Yes, this code can affect emissions as incorrect air temperature readings may disrupt the air-fuel mixture, leading to higher pollutant output.

How much does it cost to fix the P0112 code?

Repair costs vary but typically range between $50 and $200, depending on whether you need to replace the IAT sensor or address wiring issues.

Can a bad IAT sensor cause engine overheating?

While it doesn’t directly cause overheating, a malfunctioning IAT sensor can lead to improper air-fuel mixture, which may indirectly affect engine temperature.