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Engine-Codes – Mercury – P0112 Mercury

P0112 Mercury Code - Intake Air Temperature Sensor Circuit Low Input

Quick Answer

The P0112 diagnostic trouble code (DTC) for Mercury vehicles specifically refers to the Intake Air Temperature (IAT) Sensor Circuit having a low input. Common causes include Faulty Intake Air Temperature Sensor, Damaged wiring or connectors in the IAT circuit, Defective Engine Control Unit (ECU). 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 Mercury indicates Intake Air Temperature Sensor Circuit Low Input.
Common causes
Common causes include Faulty Intake Air Temperature Sensor, Damaged wiring or connectors in the IAT circuit, Defective Engine Control Unit (ECU).
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 08, 2024
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Code P0112 Mercury Description

The P0112 diagnostic trouble code (DTC) for Mercury vehicles specifically refers to the Intake Air Temperature (IAT) Sensor Circuit having a low input. The Intake Air Temperature Sensor is a crucial component of the engine management system that measures the temperature of the incoming air into the engine. This information is essential for the engine control unit (ECU) to calculate the correct air-fuel mixture for optimal combustion. When the IAT Sensor Circuit reports a low input, it means that the signal voltage from the sensor is below the expected range, indicating a potential issue with the sensor or its wiring.

OBDII Code P0112 Mercury - Intake Air Temperature Sensor Circuit Low Input
P0112 Mercury Code - Intake Air Temperature Sensor Circuit Low Input

Common Causes of P0112 Mercury

  1. Faulty Intake Air Temperature Sensor
  2. Damaged wiring or connectors in the IAT circuit
  3. Defective Engine Control Unit (ECU)
  4. Air intake system leaks or restrictions
  5. Incorrect sensor placement affecting temperature readings

Symptoms of P0112 Mercury

  1. Poor fuel economy
  2. Rough idling or engine stalling
  3. Hesitation during acceleration
  4. Check Engine Light illuminated
  5. Decreased engine performance

How to Fix P0112 Mercury

  1. Begin by locating the IAT Sensor in the intake air duct or manifold.
  2. Inspect the sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the sensor using a multimeter to ensure it is within the specified resistance range.
  4. Replace the IAT Sensor if faulty, and repair any damaged wiring or connectors.
  5. Clear the DTC with a diagnostic scan tool and test drive the vehicle to ensure the issue is resolved.

Cost to Fix P0112 Mercury

The typical repair costs for addressing a P0112 code on a Mercury vehicle can range from $100 to $300, depending on the cost of the IAT Sensor and any additional parts or labor required. It's important to note that diagnosis time and labor rates can vary, so it's advisable to check with local auto repair shops for a more accurate estimate. Rates can vary based on factors such as location, vehicle make and model, and the complexity of the repair.

What does this mean?

Tech Notes for P0112 Mercury

Before replacing the Mass Air Flow (MAF) sensor, try replacing the air filter and cleaning the Mass Air Flow sensor with Mass Air Flow sensor cleaner. Reset code and drive the vehicle. If the code comes back, it may be necessary to replace the Mass Air Flow sensor.

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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 Mercury Code

1. What are the common symptoms of OBDII code P0112 on a Mercury?

The common symptoms of code P0112 on a Mercury may include rough idling, poor fuel economy, engine stalling, and a noticeable decrease in engine performance.

2. What causes the intake air temperature sensor circuit low input code P0112 on a Mercury?

The most common causes of code P0112 on a Mercury are a faulty intake air temperature sensor, damaged wiring or connectors in the sensor circuit, or a defective engine control module (ECM).

3. How can I diagnose the intake air temperature sensor circuit low input code P0112 on my Mercury?

To diagnose code P0112 on your Mercury, you can use a multimeter to test the resistance of the intake air temperature sensor, check for any damaged wiring or connectors in the circuit, and perform a thorough inspection of the sensor itself.

4. Can a dirty air filter trigger code P0112 on a Mercury?

Yes, a dirty air filter can affect the intake air temperature sensor readings and potentially trigger code P0112 on a Mercury. It is recommended to check and replace the air filter if necessary as part of the troubleshooting process.

5. Is it safe to drive my Mercury with OBDII code P0112 triggered?

It is generally not recommended to drive your Mercury with code P0112 triggered, as it can lead to poor engine performance and potentially cause further damage. It is best to address the issue promptly to prevent any potential complications.

6. Will resetting the error code temporarily fix code P0112 on my Mercury?

Resetting the error code may temporarily clear the check engine light, but it will not fix the underlying issue causing code P0112 on your Mercury. It is important to diagnose and repair the root cause of the problem to prevent the code from reoccurring.

7. Can a DIY enthusiast repair OBDII code P0112 on a Mercury?

Depending on your skill level and access to tools, a DIY enthusiast may be able to repair code P0112 on a Mercury by replacing the intake air temperature sensor, checking and repairing any damaged wiring, or addressing other related issues.

8. What are some tips for preventing OBDII code P0112 from recurring on my Mercury?

To prevent code P0112 from recurring on your Mercury, it is important to perform regular maintenance on your vehicle, including replacing the air filter as recommended, checking the sensor wiring for any signs of damage, and ensuring proper sensor operation.

9. How much does it typically cost to repair OBDII code P0112 on a Mercury?

The cost of repairing code P0112 on a Mercury can vary depending on the specific issue causing the code, the cost of parts, and labor rates. It is recommended to consult with a mechanic or dealership for an accurate estimate based on your vehicle's needs.

10. Can a faulty intake air temperature sensor affect other systems in my Mercury?

Yes, a faulty intake air temperature sensor can affect other systems in your Mercury, such as the fuel injection system, ignition timing, and emissions control. It is important to address any sensor issues promptly to prevent further complications.

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