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Engine-Codes – BMW – P0112 BMW

P0112 BMW Code - Intake Air Temperature Sensor 1 Circuit Low Bank 1

Quick Answer

The P0112 BMW code indicates a problem with the Intake Air Temperature Sensor 1 Circuit on Bank 1. Common causes include Faulty Intake Air Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECU, Damaged Wiring: The wiring connecting the sensor to the ECU may be damaged or frayed, causing a poor connection, Poor Ground Connection: A poor ground connection can also lead to the P0112 code. 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 BMW indicates Intake Air Temperature Sensor 1 Circuit Low Bank 1.
Common causes
Common causes include Faulty Intake Air Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECU, Damaged Wiring: The wiring connecting the sensor to the ECU may be damaged or frayed, causing a poor connection, Poor Ground Connection: A poor ground connection can also lead to the P0112 code.
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 BMW Description

The P0112 BMW code indicates a problem with the Intake Air Temperature Sensor 1 Circuit on Bank 1. This sensor is responsible for measuring the temperature of the air entering the engine, which is crucial for the engine control unit (ECU) to adjust the air/fuel mixture for optimal performance and fuel efficiency. When the sensor detects a low voltage or resistance in the circuit, it triggers the P0112 code.

OBDII Code P0112 BMW - Intake Air Temperature Sensor 1 Circuit Low Bank 1
P0112 BMW Code - Intake Air Temperature Sensor 1 Circuit Low Bank 1

Common Causes of P0112 BMW

  1. Faulty Intake Air Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECU.
  2. Damaged Wiring: The wiring connecting the sensor to the ECU may be damaged or frayed, causing a poor connection.
  3. Poor Ground Connection: A poor ground connection can also lead to the P0112 code.
  4. ECU Malfunction: In some cases, the issue may stem from a malfunction in the engine control unit.

Symptoms of P0112 BMW

  1. Check Engine Light: The most common symptom associated with the P0112 code is the illumination of the Check Engine Light on the dashboard.
  2. Poor Fuel Efficiency: The vehicle may experience a decrease in fuel efficiency due to incorrect air/fuel mixture adjustments.
  3. Rough Idle: The engine may idle roughly or even stall due to improper air/fuel ratios.
  4. Acceleration Issues: The vehicle may struggle with acceleration, as the engine may not be receiving the correct amount of air for combustion.

How to Fix P0112 BMW

  1. Diagnose the Issue: Use an OBD-II scanner to confirm the P0112 code and pinpoint the exact cause of the problem.
  2. Inspect the Intake Air Temperature Sensor: Check the sensor for any visible damage or signs of malfunction.
  3. Check Wiring and Connections: Inspect the wiring harness for any damage or loose connections. Repair or replace any faulty wiring.
  4. Replace the Intake Air Temperature Sensor: If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  5. Clear the Code: After completing the repair, clear the code from the ECU using the OBD-II scanner to reset the Check Engine Light.

Cost to Fix P0112 BMW

The cost of repairing the Intake Air Temperature Sensor 1 Circuit Low Bank 1 issue can vary depending on the specific cause of the problem and the make and model of the vehicle. On average, the cost of replacing the sensor and addressing any wiring issues can range from $100 to $300, including parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more precise estimate.

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 BMW Code

1. What does the P0112 code mean on a BMW?

P0112 indicates that the Intake Air Temperature (IAT) Sensor 1 on Bank 1 is reporting a low voltage signal, which typically suggests the sensor is detecting an abnormally low temperature.

2. What are the common symptoms of a P0112 code on a BMW?

Symptoms may include poor engine performance, reduced fuel efficiency, rough idling, difficulty starting, and an illuminated check engine light.

3. What causes the P0112 code on a BMW?

Common causes include a faulty IAT sensor, damaged or corroded wiring, a short circuit, or a problem with the Engine Control Module (ECM).

4. Can a dirty air filter cause a P0112 code?

A dirty air filter is unlikely to directly cause the P0112 code, but it can affect overall airflow and engine performance, which may indirectly contribute to sensor issues.

5. How is the P0112 code diagnosed in a BMW?

A technician will use a scan tool to read the code, inspect the IAT sensor and wiring, check for proper voltage, and test the sensor’s resistance to determine if it’s within specifications.

6. Can I drive my BMW with a P0112 code?

Driving with this code is not recommended as it can lead to poor performance and potentially harm the engine over time if left unresolved.

7. How do you fix the P0112 code on a BMW?

Repairs may include replacing the IAT sensor, repairing or replacing damaged wiring, cleaning the sensor connector, or reprogramming the ECM if needed.

8. Where is the IAT sensor located on a BMW?

The IAT sensor is typically located in the intake manifold or air intake tubing, near the air filter housing.

9. How much does it cost to repair a P0112 code on a BMW?

The cost can range from $50 to $200 for parts and labor, depending on whether the sensor needs replacement or if wiring repairs are required.

10. Can a P0112 code trigger other error codes?

Yes, it may trigger related codes like P0113 (IAT Sensor Circuit High) or codes related to air-fuel mixture problems, as the ECM relies on accurate IAT readings for proper calculations.

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