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Engine-Codes – Nissan – P0112 2002 Nissan Altima Sedan

P0112 2002 Nissan Altima Sedan Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 code for a 2002 Nissan Altima Sedan indicates a problem with the Intake Air Temperature (IAT) sensor circuit, specifically a low input signal. Common causes include Faulty IAT Sensor: The sensor itself may be malfunctioning or providing incorrect readings, Damaged Wiring or Connectors: The wiring or connectors in the IAT sensor circuit may be frayed, corroded, or disconnected, Faulty ECU: The ECU may be receiving an incorrect signal from the IAT sensor due to an internal fault. 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 2002 Nissan Altima Sedan indicates Intake Air Temperature Circuit Low Input.
Common causes
Common causes include Faulty IAT Sensor: The sensor itself may be malfunctioning or providing incorrect readings, Damaged Wiring or Connectors: The wiring or connectors in the IAT sensor circuit may be frayed, corroded, or disconnected, Faulty ECU: The ECU may be receiving an incorrect signal from the IAT sensor due to an internal fault.
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 2002 Nissan Altima Sedan Description

The P0112 code for a 2002 Nissan Altima Sedan indicates a problem with the Intake Air Temperature (IAT) sensor circuit, specifically a low input signal. The IAT sensor is a crucial component of the engine management system, as it measures the temperature of the air entering the engine. This information is vital for the engine control unit (ECU) to adjust the air-fuel mixture and ignition timing for optimal performance and fuel efficiency.

OBDII Code P0112 2002 Nissan Altima Sedan - Intake Air Temperature Circuit Low Input
P0112 2002 Nissan Altima Sedan Code - Intake Air Temperature Circuit Low Input

Common Causes of P0112 2002 Nissan Altima Sedan

  1. Faulty IAT Sensor: The sensor itself may be malfunctioning or providing incorrect readings.
  2. Damaged Wiring or Connectors: The wiring or connectors in the IAT sensor circuit may be frayed, corroded, or disconnected.
  3. Faulty ECU: The ECU may be receiving an incorrect signal from the IAT sensor due to an internal fault.
  4. Intake Air Leaks: Leaks in the intake system can affect the IAT sensor readings and trigger the P0112 code.
  5. Poor Electrical Ground: A weak or poor electrical ground connection can also cause issues with the IAT sensor circuit.

Symptoms of P0112 2002 Nissan Altima Sedan

  1. Check Engine Light: The most obvious symptom of the P0112 code is the illumination of the Check Engine Light on the dashboard.
  2. Poor Fuel Economy: The vehicle may experience decreased fuel efficiency due to the incorrect air-fuel mixture.
  3. Rough Idling: The engine may idle roughly or inconsistently, leading to a shaky or vibrating sensation in the vehicle.
  4. Hesitation or Stalling: The engine may hesitate or stall during acceleration, especially under load or at higher speeds.
  5. Increased Emissions: The vehicle may produce higher emissions than normal and could potentially fail an emissions test.

How to Fix P0112 2002 Nissan Altima Sedan

  1. Diagnose the Issue: Use a scan tool to retrieve the specific P0112 code and perform a visual inspection of the IAT sensor and its wiring and connectors.
  2. Test the IAT Sensor: Check the resistance of the IAT sensor and compare it to the manufacturer's specifications to determine if it is faulty.
  3. Inspect Wiring and Connectors: Check the wiring and connectors for any damage or corrosion and repair or replace as needed.
  4. Check ECU: If the sensor and wiring are in good condition, check the ECU for any faults or errors that may be causing the low input signal.
  5. Clear Codes and Test Drive: Clear the P0112 code from the ECU memory, and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0112 2002 Nissan Altima Sedan

The typical repair costs for addressing the P0112 code on a 2002 Nissan Altima Sedan can vary depending on the specific cause of the issue. On average, the parts needed for this repair, such as a new IAT sensor or wiring connectors, can range from $50 to $150. Labor costs can add an additional $100 to $200, depending on the shop's hourly rates and the time required for diagnosis and repair.

What does this mean?

Tech Notes for P0112 2002 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 2002 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0112 in a 2002 Nissan Altima Sedan?

The common symptoms of code P0112 in a 2002 Nissan Altima Sedan include rough idling, decreased fuel efficiency, and potential engine stalling.

2. What does the OBDII code P0112 on a 2002 Nissan Altima Sedan mean?

Code P0112 indicates that the Intake Air Temperature (IAT) sensor is sending a low input signal to the Engine Control Module (ECM).

3. What are the possible causes of OBDII code P0112 in a 2002 Nissan Altima Sedan?

Possible causes of code P0112 in a 2002 Nissan Altima Sedan include a faulty IAT sensor, damaged wiring or connectors in the IAT circuit, or issues with the ECM.

4. How can I diagnose the cause of OBDII code P0112 in my 2002 Nissan Altima Sedan?

To diagnose code P0112, you can start by checking the IAT sensor's electrical connections, inspecting the sensor for damage, and using a multimeter to test the sensor's resistance.

5. Can a dirty air filter trigger OBDII code P0112 in a 2002 Nissan Altima Sedan?

Yes, a dirty air filter can affect the IAT sensor readings and potentially trigger code P0112 due to inaccurate temperature readings.

6. How can I reset OBDII code P0112 in my 2002 Nissan Altima Sedan?

Resetting code P0112 involves using an OBDII scanner to clear the code from the ECM's memory after addressing and fixing the underlying issue with the IAT sensor.

7. Is it safe to continue driving with OBDII code P0112 present in a 2002 Nissan Altima Sedan?

While the vehicle may still be operable with code P0112, it is recommended to address the issue promptly to prevent further engine performance problems and potential damage.

8. Can I replace the IAT sensor myself to fix OBDII code P0112 in a 2002 Nissan Altima Sedan?

Yes, replacing the IAT sensor is a relatively straightforward DIY repair that can help resolve code P0112 in a 2002 Nissan Altima Sedan.

9. Are there any aftermarket IAT sensor options available for a 2002 Nissan Altima Sedan to address code P0112?

Yes, there are aftermarket IAT sensor options available for a 2002 Nissan Altima Sedan that can be a cost-effective solution for fixing code P0112.

10. How can proper maintenance help prevent OBDII code P0112 in a 2002 Nissan Altima Sedan?

Regularly inspecting and replacing the air filter, checking the IAT sensor connections, and ensuring the intake system is clean can help prevent issues that lead to code P0112 in a 2002 Nissan Altima Sedan.

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