AutoCodes – Nissan – P0112 2009 Nissan Sentra

P0112 2009 Nissan Sentra Code - Intake Air Temperature Circuit Low Input

Quick Answer

The Intake Air Temperature (IAT) sensor is built into mass air flow sensor or in some vehicles mounted to the air filter duct housing. Common causes include Faulty Intake Air Temperature (IAT) sensor, Dirty air filter, Intake Air Temperature (IAT) sensor harness is open or shorted. 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 Sentra indicates Intake Air Temperature Circuit Low Input.
Common causes: Common causes include Faulty Intake Air Temperature (IAT) sensor, Dirty air filter, Intake Air Temperature (IAT) sensor harness is open or shorted.
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.

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Code Popularity 4,074

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0112 2009 Nissan Sentra Description

The Intake Air Temperature (IAT) sensor is built into mass air flow sensor or in some vehicles mounted to the air filter duct housing. The sensor detects intake air temperature and transmits a signal to the Engine Control Module (ECM).The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise. The Intake Air Temperature signal is used as an input for various systems in the vehicle.

OBDII Code P0112 2009 Nissan Sentra - Intake Air Temperature Circuit Low Input - AutoCodes.com — P0112 2009 Nissan Sentra Code - Intake Air Temperature Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0112 2009 Nissan Sentra?

Faulty Intake Air Temperature (IAT) sensor
Dirty air filter
Intake Air Temperature (IAT) sensor harness is open or shorted
Intake Air Temperature (IAT) sensor circuit poor electrical connection

How to Fix the DTC P0112 2009 Nissan Sentra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compressed air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replace the mass air flow sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0112 2009 Nissan Sentra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0112 2009 Nissan Sentra code?

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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 Sentra Code

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

- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and possible stalling.

2. What is the most likely cause of the P0112 code in a 2009 Nissan Sentra?

- The most common cause is a malfunctioning intake air temperature (IAT) sensor or a wiring issue in the IAT circuit.

3. How can I diagnose the P0112 code on my 2009 Nissan Sentra?

- Diagnose the code by checking the IAT sensor for proper connection, inspecting the sensor for damage, and testing the sensor's resistance using a multimeter.

4. Can a dirty air filter trigger the P0112 code in a 2009 Nissan Sentra?

- A dirty air filter may indirectly affect the IAT sensor readings, potentially leading to the P0112 code being triggered.

5. What are some repair tips for fixing the P0112 code in a 2009 Nissan Sentra?

- Repair tips include checking and cleaning the IAT sensor, ensuring proper wiring connections, and replacing the sensor if necessary.

6. Is it safe to continue driving my 2009 Nissan Sentra with the P0112 code present?

- It is not recommended to drive with the P0112 code active, as it can lead to further engine issues and potential damage if left unresolved.

7. How much does it typically cost to repair the P0112 code in a 2009 Nissan Sentra?

- The cost of repairs can vary depending on the root cause, but typically, replacing an IAT sensor can range from $50 to $150, including parts and labor.

8. Can a DIY enthusiast fix the P0112 code in a 2009 Nissan Sentra?

- Yes, some DIY enthusiasts with automotive repair experience can fix the P0112 code by following online guides and using basic tools.

9. Will resetting the OBDII system clear the P0112 code in a 2009 Nissan Sentra?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue persists, the code is likely to reappear after driving the vehicle.

10. How crucial is it to address the P0112 code promptly in a 2009 Nissan Sentra?

- It is essential to address the P0112 code promptly to prevent potential engine damage, ensure optimal performance, and maintain fuel efficiency in your Nissan Sentra.