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P0112 2003 Nissan Altima Sedan Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 diagnostic trouble code (DTC) in a 2003 Nissan Altima Sedan indicates an issue with the Intake Air Temperature (IAT) sensor circuit reporting a low input. Common causes include Faulty IAT sensor, Damaged wiring or connectors in the IAT circuit, Malfunctioning ECM. 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 2003 Nissan Altima Sedan indicates Intake Air Temperature Circuit Low Input.
Common causes
Common causes include Faulty IAT sensor, Damaged wiring or connectors in the IAT circuit, Malfunctioning ECM.
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 12, 2024
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Code P0112 2003 Nissan Altima Sedan Description

The P0112 diagnostic trouble code (DTC) in a 2003 Nissan Altima Sedan indicates an issue with the Intake Air Temperature (IAT) sensor circuit reporting a low input. The IAT sensor is responsible for measuring the temperature of the incoming air to the engine. This information is crucial for the Engine Control Module (ECM) to adjust the air-fuel mixture for optimal combustion efficiency. A low input signal from the IAT sensor can lead to incorrect fuel delivery, ignition timing, and overall engine performance.

OBDII Code P0112 2003 Nissan Altima Sedan - Intake Air Temperature Circuit Low Input
P0112 2003 Nissan Altima Sedan Code - Intake Air Temperature Circuit Low Input

Common Causes of P0112 2003 Nissan Altima Sedan

  1. Faulty IAT sensor
  2. Damaged wiring or connectors in the IAT circuit
  3. Malfunctioning ECM
  4. Air intake system issues
  5. Environmental factors affecting sensor performance (e.g., heat exposure)

Symptoms of P0112 2003 Nissan Altima Sedan

  1. Reduced fuel efficiency
  2. Rough idling or stalling
  3. Hesitation during acceleration
  4. Engine misfires
  5. Check Engine Light illuminated

How to Fix P0112 2003 Nissan Altima Sedan

  1. Diagnose the issue by using a scan tool to read the DTC and check the IAT sensor's voltage output.
  2. Inspect the wiring and connectors in the IAT circuit for any damage or corrosion.
  3. Test the IAT sensor resistance to determine if it is within specifications.
  4. Replace the faulty IAT sensor if it is not functioning properly.
  5. Clear the DTC with a scan tool and perform a road test to ensure the issue has been resolved.

Cost to Fix P0112 2003 Nissan Altima Sedan

The typical repair costs for addressing a P0112 code in a 2003 Nissan Altima Sedan can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor in your area. It's essential to factor in potential diagnostics time and labor rates, which can vary based on location, shop rates, and the complexity of the repair. It's advisable to consult with a local auto repair shop for a more accurate estimate based on your specific situation.

What does this mean?

Tech Notes for P0112 2003 Nissan Altima Sedan

Since the Intake Air Temperature (IAT) Sensor is par of the Mass Air Flow (MAF) Sensor, start by cleaning the MAF. If the problem persists the MAF may need to be replaced.

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 2003 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0112 on a 2003 Nissan Altima Sedan?

- The common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and in some cases, the Check Engine Light may illuminate.

2. What does the OBDII code P0112 indicate on a 2003 Nissan Altima Sedan?

- OBDII code P0112 indicates that the Intake Air Temperature (IAT) sensor circuit is reporting a low input, which can affect the engine's performance.

3. What are the possible causes of OBDII code P0112 on a 2003 Nissan Altima Sedan?

- The possible causes include a faulty IAT sensor, damaged wiring or connectors in the IAT circuit, or issues with the engine control module (ECM).

4. How can I diagnose the OBDII code P0112 on my 2003 Nissan Altima Sedan?

- You can diagnose the code by visually inspecting the IAT sensor and its wiring, testing the sensor's resistance, and using a scan tool to monitor the sensor's readings.

5. Can a dirty air filter cause OBDII code P0112 on a 2003 Nissan Altima Sedan?

- While a dirty air filter can affect the engine's performance, it is not a direct cause of OBDII code P0112. Focus on checking the IAT sensor and related components.

6. Is it safe to continue driving with OBDII code P0112 on a 2003 Nissan Altima Sedan?

- It is not recommended to drive with this code as it can lead to poor engine performance and potential damage. It is best to address the issue promptly.

7. How can I repair OBDII code P0112 on my 2003 Nissan Altima Sedan?

- Repair options include replacing the faulty IAT sensor, repairing damaged wiring or connectors, or resetting the ECM after addressing the issue.

8. Can I fix OBDII code P0112 on a 2003 Nissan Altima Sedan myself?

- Depending on your automotive repair skills, you may be able to replace the IAT sensor or check the wiring yourself. However, for complex issues, it's best to consult a professional mechanic.

9. Will resetting the Check Engine Light resolve OBDII code P0112 on a 2003 Nissan Altima Sedan?

- Resetting the Check Engine Light may temporarily turn it off, but if the underlying issue causing P0112 is not fixed, the light will likely come back on.

10. How much does it cost to repair OBDII code P0112 on a 2003 Nissan Altima Sedan?

- The cost of repairing P0112 can vary depending on the specific issue. Replacing an IAT sensor can cost around $50-$150, while addressing wiring or ECM problems may be more expensive.

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