AutoCodes – Toyota – P0112 2001 Toyota Highlander

P0112 2001 Toyota Highlander Code - Intake Air Temperature Circuit Low Input

Quick Answer

The Intake Air Temperature (IAT) sensor is built into mass air flow sensor or in some vehicles mounted to the air filter duct housing. Common causes include Faulty Intake Air Temperature (IAT) sensor, Dirty air filter, Intake Air Temperature (IAT) 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 2001 Toyota Highlander indicates Intake Air Temperature Circuit Low Input.
Common causes: Common causes include Faulty Intake Air Temperature (IAT) sensor, Dirty air filter, Intake Air Temperature (IAT) 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 3,054

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0112 2001 Toyota Highlander Description

The Intake Air Temperature (IAT) sensor is built into mass air flow sensor or in some vehicles mounted to the air filter duct housing. The sensor detects intake air temperature and transmits a signal to the Engine Control Module (ECM).The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise. The Intake Air Temperature signal is used as an input for various systems in the vehicle.

OBDII Code P0112 2001 Toyota Highlander - Intake Air Temperature Circuit Low Input - AutoCodes.com — P0112 2001 Toyota Highlander Code - Intake Air Temperature Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0112 2001 Toyota Highlander?

Faulty Intake Air Temperature (IAT) sensor
Dirty air filter
Intake Air Temperature (IAT) sensor harness is open or shorted
Intake Air Temperature (IAT) sensor circuit poor electrical connection

How to Fix the DTC P0112 2001 Toyota Highlander?

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 does this mean?

Code Tech Notes

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0112 2001 Toyota Highlander 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 2001 Toyota Highlander code?

Need more information on how to fix the P0112 2001 Toyota Highlander code? Get Access to Factory Service Manuals

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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 2001 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0112 on a 2001 Toyota Highlander?

- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and potential stalling.

2. What does the OBDII code P0112 for a 2001 Toyota Highlander mean?

- The code P0112 indicates that the Intake Air Temperature (IAT) sensor circuit is registering a low input voltage.

3. What are the possible causes of OBDII code P0112 on a 2001 Toyota Highlander?

- Possible causes include a faulty IAT sensor, damaged sensor wiring, loose connections, or a problem with the engine control module.

4. How can I diagnose the OBDII code P0112 on my 2001 Toyota Highlander?

- You can diagnose the code by checking the IAT sensor for proper operation, inspecting the sensor wiring for damage, and testing the sensor's voltage output.

5. Can a dirty air filter trigger the OBDII code P0112 on a 2001 Toyota Highlander?

- While a dirty air filter can indirectly affect sensor readings, it is not a direct cause of the P0112 code. Focus on checking the IAT sensor and its circuitry first.

6. Is it safe to continue driving my 2001 Toyota Highlander with the P0112 code?

- It is not recommended to drive your vehicle with the P0112 code present, as it can lead to engine performance issues and potential damage if left unresolved.

7. How can I repair the OBDII code P0112 on my 2001 Toyota Highlander?

- Repair options include replacing the faulty IAT sensor, repairing damaged wiring, ensuring proper connections, and clearing the fault code with an OBDII scanner.

8. Will resetting the OBDII code P0112 on my 2001 Toyota Highlander make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear after driving cycles.

9. Can a DIY enthusiast fix the OBDII code P0112 on a 2001 Toyota Highlander?

- Depending on your skill level and access to tools, DIY enthusiasts can attempt to diagnose and repair the P0112 code by following repair guides and using proper diagnostic equipment.

10. How much does it typically cost to repair the OBDII code P0112 on a 2001 Toyota Highlander at a professional repair shop?

- The cost of repair can vary depending on the exact cause of the code, but it may range from $100 to $300 for parts and labor at a professional repair shop.