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Engine-Codes – Toyota – P0112 2004 Toyota Highlander

P0112 2004 Toyota Highlander Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 code for a 2004 Toyota Highlander refers to an issue with the Intake Air Temperature (IAT) sensor circuit registering a low input. Common causes include Faulty IAT sensor, Damaged wiring or connectors in the sensor circuit, Vacuum leak in the intake system. 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 2004 Toyota Highlander indicates Intake Air Temperature Circuit Low Input.
Common causes
Common causes include Faulty IAT sensor, Damaged wiring or connectors in the sensor circuit, Vacuum leak in the intake system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0112 2004 Toyota Highlander Description

The P0112 code for a 2004 Toyota Highlander refers to an issue with the Intake Air Temperature (IAT) sensor circuit registering a low input. The IAT sensor is responsible for measuring the temperature of the air entering the engine, which is crucial for determining the correct air-fuel mixture for combustion. When the sensor detects a low input, it means that the temperature reading is lower than expected, which can lead to incorrect fuel delivery and combustion timing.

OBDII Code P0112 2004 Toyota Highlander - Intake Air Temperature Circuit Low Input
P0112 2004 Toyota Highlander Code - Intake Air Temperature Circuit Low Input

Common Causes of P0112 2004 Toyota Highlander

  1. Faulty IAT sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Vacuum leak in the intake system
  4. Engine control module (ECM) malfunction
  5. Ambient temperature affecting sensor readings

Symptoms of P0112 2004 Toyota Highlander

  1. Decreased fuel efficiency
  2. Engine running rough or stalling
  3. Check Engine Light illuminated
  4. Lack of power or acceleration
  5. Increased emissions

How to Fix P0112 2004 Toyota Highlander

  1. Begin by identifying the location of the IAT sensor in the intake system.
  2. Inspect the sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the sensor using a multimeter to check for proper resistance readings.
  4. Replace the IAT sensor if it is found to be faulty.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0112 2004 Toyota Highlander

The cost of repairing a P0112 code on a 2004 Toyota Highlander can vary depending on the specific cause of the issue. On average, replacing an IAT sensor can cost between $50 and $150 for the part alone. Labor costs can range from $80 to $150 per hour, and the total repair bill may amount to $150 to $300. However, it's important to note that prices may vary based on the location of the repair shop, the vehicle's make and model, and the extent of the repairs needed. It's recommended to obtain quotes from multiple auto repair shops to get a more accurate estimate.

What does this mean?

Tech Notes for P0112 2004 Toyota Highlander

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.

When is the Code Detected?

An excessively low voltage from the sensor is sent to ECM.

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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 2004 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0112 on a 2004 Toyota Highlander?

The common symptoms of code P0112 on a 2004 Toyota Highlander include poor engine performance, rough idling, stalling, and a decrease in fuel efficiency.

2. What does the OBDII code P0112 "Intake Air Temperature Circuit Low Input" mean for a 2004 Toyota Highlander?

Code P0112 indicates that the Intake Air Temperature (IAT) sensor is reporting a temperature below the expected range, potentially due to a faulty sensor or wiring issue.

3. What are the possible causes of OBDII code P0112 on a 2004 Toyota Highlander?

Possible causes of code P0112 on a 2004 Toyota Highlander include a defective IAT sensor, damaged wiring or connectors, a faulty Engine Control Module (ECM), or issues with the air intake system.

4. How can I diagnose the OBDII code P0112 on my 2004 Toyota Highlander?

To diagnose code P0112, you can use an OBDII scanner to check the freeze frame data, visually inspect the IAT sensor and its connections, and perform continuity tests on the wiring harness.

5. Can I drive my 2004 Toyota Highlander with OBDII code P0112?

It is not recommended to drive your 2004 Toyota Highlander with code P0112, as it can lead to further engine damage and increased emissions. It's best to address the issue promptly.

6. How can I repair OBDII code P0112 on a 2004 Toyota Highlander?

To repair code P0112, you may need to replace the faulty IAT sensor, repair damaged wiring or connectors, reset the ECM, and clear the trouble codes using an OBDII scanner.

7. Will resetting the OBDII code P0112 on my 2004 Toyota Highlander fix the issue?

Resetting the code may temporarily clear the Check Engine Light, but if the underlying issue causing code P0112 is not addressed, the code is likely to reappear.

8. Is OBDII code P0112 a serious issue for a 2004 Toyota Highlander?

While code P0112 may not cause immediate harm to your 2004 Toyota Highlander, it can lead to performance issues and reduced fuel efficiency if left unresolved.

9. Can a DIY enthusiast fix OBDII code P0112 on a 2004 Toyota Highlander?

Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair code P0112 by replacing the IAT sensor or repairing wiring issues.

10. How much does it cost to fix OBDII code P0112 on a 2004 Toyota Highlander?

The cost of fixing code P0112 on a 2004 Toyota Highlander can vary depending on the root cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

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