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Engine-Codes – Nissan – P0112 2004 Nissan Altima Sedan

P0112 2004 Nissan Altima Sedan Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 code for a 2004 Nissan Altima Sedan indicates a problem with the Intake Air Temperature (IAT) sensor circuit. Common causes include Faulty IAT sensor, Damaged wiring or connectors in the sensor circuit, ECM malfunction. 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 Nissan Altima Sedan indicates Intake Air Temperature Circuit Low Input.
Common causes
Common causes include Faulty IAT sensor, Damaged wiring or connectors in the sensor circuit, ECM malfunction.
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 Nissan Altima Sedan Description

The P0112 code for a 2004 Nissan Altima Sedan indicates a problem with the Intake Air Temperature (IAT) sensor circuit. The IAT sensor is responsible for measuring the temperature of the air entering the engine, which is crucial for the proper functioning of the engine management system. A low input signal from the IAT sensor suggests that the temperature reading is below the expected range, which can lead to various performance issues.

OBDII Code P0112 2004 Nissan Altima Sedan - Intake Air Temperature Circuit Low Input
P0112 2004 Nissan Altima Sedan Code - Intake Air Temperature Circuit Low Input

Common Causes of P0112 2004 Nissan Altima Sedan

  1. Faulty IAT sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. ECM malfunction
  4. Air intake restrictions
  5. Extreme temperature conditions affecting sensor performance

Symptoms of P0112 2004 Nissan Altima Sedan

  1. Poor fuel efficiency
  2. Rough idling or stalling
  3. Engine hesitation or lack of power
  4. Check Engine Light illuminated
  5. Engine overheating (in severe cases)

How to Fix P0112 2004 Nissan Altima Sedan

  1. Begin by conducting a visual inspection of the IAT sensor, wiring, and connectors for any visible damage or corrosion.
  2. Test the IAT sensor using a multimeter to check for proper resistance values within the specified range.
  3. If the sensor tests within range, inspect the wiring harness for continuity and repair any damaged wires or connectors.
  4. Clear the diagnostic trouble codes from the ECM using a scan tool, and retest the vehicle to ensure the P0112 code does not return.
  5. If the issue persists, consider replacing the IAT sensor or consulting a professional technician for further diagnosis and repair.

Cost to Fix P0112 2004 Nissan Altima Sedan

The typical repair costs for resolving a P0112 code on a 2004 Nissan Altima Sedan can range from $100 to $300, depending on the exact cause of the issue and the cost of parts and labor. This estimate includes the price of a new IAT sensor, wiring repairs, and diagnostic testing. However, it is essential to note that actual repair costs can vary based on factors such as location, shop rates, and the extent of the repairs needed. It is advisable to consult with a trusted mechanic or repair shop for a more accurate estimate based on your specific situation.

What does this mean?

Tech Notes for P0112 2004 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 2004 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0112 in a 2004 Nissan Altima Sedan?

The common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P0112 for a 2004 Nissan Altima Sedan indicate?

The code P0112 indicates an issue with the Intake Air Temperature (IAT) sensor circuit, specifically a low input signal.

3. What are the possible causes of the P0112 code in a 2004 Nissan Altima Sedan?

Possible causes include a faulty IAT sensor, damaged wiring or connectors in the IAT circuit, a disconnected or corroded sensor connector, or a problem with the engine control module (ECM).

4. How can I diagnose the P0112 code in my 2004 Nissan Altima Sedan?

You can diagnose the P0112 code by visually inspecting the IAT sensor and its wiring, testing the sensor for proper resistance values, and using a scan tool to monitor IAT sensor data.

5. Is it safe to drive my 2004 Nissan Altima Sedan with the P0112 code?

It is generally not recommended to drive the vehicle with the P0112 code active, as it can lead to poor engine performance and potential damage over time. It is best to address the issue promptly.

6. Can I repair the P0112 code in my 2004 Nissan Altima Sedan myself?

Depending on your mechanical skills, you may be able to repair the P0112 code yourself by replacing the faulty IAT sensor, repairing damaged wiring, or addressing connector issues. However, professional help may be needed for more complex issues.

7. How much does it typically cost to repair the P0112 code in a 2004 Nissan Altima Sedan?

The cost of repairing the P0112 code can vary depending on the underlying cause. Simple fixes like replacing the IAT sensor may cost around $50-$100, while more complex issues could cost several hundred dollars at a repair shop.

8. Will resetting the check engine light resolve the P0112 code in my 2004 Nissan Altima Sedan?

Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing the P0112 code. It is important to diagnose and address the root cause of the problem.

9. Can a malfunctioning IAT sensor cause other problems in a 2004 Nissan Altima Sedan?

Yes, a malfunctioning IAT sensor can cause issues such as incorrect air/fuel mixture, poor engine performance, and potential damage to engine components if left unresolved.

10. How often should the IAT sensor be inspected or replaced in a 2004 Nissan Altima Sedan?

The IAT sensor should be inspected during regular maintenance checks, and it should be replaced if any issues are detected or if it fails diagnostic tests related to the P0112 code.

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