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Engine-Codes – Nissan – P0112 2009 Nissan Altima Sedan

P0112 2009 Nissan Altima Sedan Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 code for a 2009 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, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination affecting the sensor. 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 2009 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, Corrosion or contamination affecting the sensor.
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 Aug 19, 2024
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Code P0112 2009 Nissan Altima Sedan Description

The P0112 code for a 2009 Nissan Altima Sedan indicates a problem with the Intake Air Temperature (IAT) sensor circuit, specifically a low input signal. The IAT sensor is responsible for measuring the temperature of the air entering the engine, which is crucial for the engine control unit (ECU) to adjust fuel delivery and ignition timing. A low input signal suggests that the temperature reading from the sensor is lower than expected, which can lead to incorrect fuel mixture, timing, and overall engine performance.

OBDII Code P0112 2009 Nissan Altima Sedan - Intake Air Temperature Circuit Low Input
P0112 2009 Nissan Altima Sedan Code - Intake Air Temperature Circuit Low Input

Common Causes of P0112 2009 Nissan Altima Sedan

  1. Faulty IAT sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or contamination affecting the sensor
  4. ECU malfunction or software issues

Symptoms of P0112 2009 Nissan Altima Sedan

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Engine hesitation or lack of acceleration
  4. Check Engine Light illuminated on the dashboard

How to Fix P0112 2009 Nissan Altima Sedan

  1. Begin by diagnosing the issue using a diagnostic scanner to confirm the P0112 code.
  2. Inspect the IAT sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the IAT sensor's resistance and voltage output to determine if it is functioning correctly.
  4. Replace the IAT sensor if found to be faulty, ensuring proper installation and connection.
  5. Clear the diagnostic trouble codes, reset the ECU, and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0112 2009 Nissan Altima Sedan

The typical repair costs for addressing a P0112 code on a 2009 Nissan Altima Sedan can vary depending on the specific cause of the issue. In general, replacing the IAT sensor and addressing any related wiring or connector issues may cost between $100 to $300 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's advisable to check with local providers for a more accurate estimate.

What does this mean?

Tech Notes for P0112 2009 Nissan Altima Sedan

Intake Air Temperature (IAT) sensor is built into the mass air flow sensor. Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or 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 2009 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0112 in a 2009 Nissan Altima Sedan?

- Common symptoms include a decrease in fuel efficiency, engine stalling or rough idling, and potential issues with the vehicle's acceleration.

2. What does the OBDII code P0112 on a 2009 Nissan Altima Sedan indicate?

- OBDII code P0112 indicates that the Intake Air Temperature (IAT) sensor circuit is registering a low input, potentially leading to incorrect air/fuel mixture calculations by the engine control module.

3. What are the possible causes of the Intake Air Temperature Circuit Low Input code in a 2009 Nissan Altima Sedan?

- Possible causes include a faulty IAT sensor, damaged wiring or connectors in the IAT circuit, issues with the engine control module, or a problem with the intake air temperature sensor itself.

4. How can I diagnose the cause of OBDII code P0112 in my 2009 Nissan Altima Sedan?

- To diagnose the issue, you can start by inspecting the IAT sensor and its wiring for any visible damage. Using a multimeter, you can also test the sensor's resistance and voltage readings to determine if it is functioning correctly.

5. Can I drive my 2009 Nissan Altima Sedan with the P0112 code present?

- It is not recommended to drive your vehicle with the P0112 code present, as it can lead to poor engine performance and potential long-term damage. It is best to address the issue promptly.

6. How can I repair OBDII code P0112 in my 2009 Nissan Altima Sedan?

- Repairing the P0112 code typically involves replacing the faulty IAT sensor, repairing any damaged wiring or connectors, or addressing any issues with the engine control module as needed.

7. Will resetting the OBDII code P0112 in my 2009 Nissan Altima Sedan make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue causing the P0112 code is not addressed, it is likely to reappear. It is important to diagnose and repair the root cause of the problem.

8. Are there any DIY tips for fixing the Intake Air Temperature Circuit Low Input code in a 2009 Nissan Altima Sedan?

- DIY tips include checking and cleaning the IAT sensor, inspecting the wiring for any visible damage, and ensuring all connections are secure. However, for more complex issues, it is recommended to seek professional help.

9. How much does it typically cost to repair OBDII code P0112 in a 2009 Nissan Altima Sedan?

- The cost of repairing the P0112 code can vary depending on the specific cause of the issue and labor rates in your area. On average, the cost can range from $100 to $300 for parts and labor.

10. Can a faulty IAT sensor cause other issues in a 2009 Nissan Altima Sedan besides triggering the P0112 code?

- Yes, a faulty IAT sensor can potentially cause other issues such as poor engine performance, incorrect fuel mixture, and even trigger additional trouble codes related to the intake air temperature.

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