The P112F error code is a common issue that BMW owners may encounter. This code indicates that the manifold absolute pressure to throttle angle is too high on bank 1. The error code can be triggered by a variety of issues, such as a bad vacuum line or a damaged hose in the system.
When the P112F code appears, it can cause a number of problems with the vehicle’s performance, including reduced power and acceleration, as well as decreased fuel efficiency. It is important to address the issue as soon as possible to avoid further damage to the engine and other components.
Fortunately, there are several possible solutions to the P112F code, including intake manifold gasket replacement or mass airflow sensor replacement. However, it is recommended to have the issue diagnosed by a professional mechanic to ensure an accurate diagnosis and proper repair. With the right knowledge and expertise, BMW owners can quickly resolve the P112F error code and get back to enjoying their vehicle’s performance.
P112F BMW: Code Definition
P112F is a diagnostic trouble code (DTC) that is associated with BMW vehicles. It relates to the manifold absolute pressure (MAP) sensor and the throttle angle sensor. The code is stored when the relationship between the MAP sensor and the mass airflow calculated based on the throttle-valve angle is not correct.
When the engine control module (ECM) detects a fault with the MAP sensor, it will trigger the P112F BMW code. The ECM will illuminate the check engine light and store the code in its memory.
The P112F BMW code is specific to Bank 1, which refers to the side of the engine where the number 1 cylinder is located. The code indicates that there is an issue with the MAP sensor’s signal on Bank 1.
The P112F BMW code is a generic code, which means that it is the same across all BMW models. However, the specific causes and symptoms of the code may vary depending on the vehicle.
In the next section, we will discuss the possible causes, symptoms, and tech notes associated with the P112F BMW code.
Common Symptoms
When a BMW vehicle encounters the P112F code, it can result in a range of symptoms that can affect the vehicle’s performance and drivability. Here are some of the most common symptoms associated with the P112F code:
- Illuminated Check Engine Light: The most common symptom of the P112F code is an illuminated check engine light on the vehicle’s dashboard. This light indicates that there is a problem with the vehicle’s engine or emissions system and requires attention from a qualified technician.
- Reduced Engine Power: In some cases, the P112F code can cause the engine to lose power or run rough. This can make it difficult to accelerate or maintain a consistent speed while driving.
- Poor Fuel Economy: When the P112F code is present, the engine may not be operating efficiently, which can result in reduced fuel economy. This means that the vehicle may require more frequent refueling, which can be costly over time.
- Stalling: In severe cases, the P112F code can cause the engine to stall or shut off completely. This can be dangerous if it occurs while the vehicle is in motion, as it can result in a loss of control.
If any of these symptoms are present in a BMW vehicle, it is important to have the vehicle inspected by a qualified technician as soon as possible to diagnose and repair the issue.
Possible Causes
The P112F BMW code indicates a problem with the Manifold Absolute Pressure (MAP) sensor or the Throttle Body. Here are some of the possible causes of this code:
- Faulty Intake Pipe Vacuum Sensor: The intake pipe vacuum sensor may be faulty, which can cause the MAP sensor to send incorrect readings to the engine control module (ECM). This can result in the P112F code being triggered.
- Intake Pipe Vacuum Sensor Harness Issues: If the harness of the intake pipe vacuum sensor is open or shorted, it can cause the sensor to malfunction and trigger the P112F code.
- Poor Electrical Connection: A poor electrical connection to the intake pipe vacuum sensor can cause the sensor to send incorrect readings to the ECM, which can trigger the P112F code.
- Faulty Throttle Body: The throttle body may be faulty, which can cause the MAP sensor to send incorrect readings to the ECM. This can result in the P112F code being triggered.
If any of the above issues are present, it is recommended to check and fix them before proceeding with any further diagnosis.
Diagnosing and Fixing P112F BMW Code
1. Professional Diagnosis
When it comes to diagnosing and fixing the P112F BMW code, it is recommended to seek professional help. A certified BMW mechanic will have access to specialized tools and equipment that are required for accurate diagnosis and repair.
The mechanic will start by connecting the BMW diagnostic tool to the vehicle’s OBD-II port to retrieve the trouble code. They will then perform a visual inspection of the throttle body, intake manifold, and vacuum lines to check for any signs of damage or wear.
Next, the mechanic will perform a series of tests to determine the root cause of the problem. This may include checking the throttle position sensor, the manifold absolute pressure sensor, and the intake air temperature sensor. The mechanic may also check for any vacuum leaks or issues with the fuel system.
Once the problem has been identified, the mechanic will provide a detailed report of the repairs needed and the associated costs.
2. DIY Diagnosis
If you’re a DIY enthusiast, you can attempt to diagnose and fix the P112F BMW code yourself. However, it’s important to note that this can be a complex and time-consuming process, and may require specialized tools and equipment.
To start, you’ll need to purchase a BMW diagnostic tool that is compatible with your vehicle. This will allow you to retrieve the trouble code and perform a series of tests to determine the root cause of the problem.
Next, you’ll need to perform a visual inspection of the throttle body, intake manifold, and vacuum lines to check for any signs of damage or wear. You may also need to check the throttle position sensor, the manifold absolute pressure sensor, and the intake air temperature sensor.
If you’re comfortable with working on your vehicle, you can attempt to make the necessary repairs yourself. However, it’s important to follow the manufacturer’s instructions carefully and to use the correct tools and equipment.
Preventing P112F BMW Code
1. Regular Maintenance
Regular maintenance is essential to prevent the P112F BMW code. The throttle body should be inspected and cleaned regularly to ensure it is functioning correctly. A dirty throttle body can cause the throttle plate to stick, which can lead to a high manifold pressure to throttle angle. The air intake system should also be inspected for damage or leaks, which can cause vacuum leaks and trigger the P112F code.
2. Early Detection
Early detection is critical to preventing the P112F BMW code from causing significant damage to the engine. The driver should be aware of any changes in the vehicle’s performance, such as reduced power or acceleration. A check engine light may also indicate a problem with the throttle body or air intake system. As soon as any issues are detected, the vehicle should be taken to a qualified mechanic for inspection and repair.
Regular maintenance and early detection are the keys to preventing the P112F BMW code. By keeping the throttle body and air intake system in good condition and detecting any issues early, drivers can avoid costly repairs and keep their BMW running smoothly.
Conclusion
In conclusion, the P112F code in BMW vehicles is related to the Manifold Absolute Pressure to Throttle Angle being too high on Bank 1. This code can be caused by a variety of issues, ranging from a faulty intake pipe vacuum sensor to a cracked cylinder head.
When diagnosing this code, it is important to visually inspect the related wiring harness and connectors and check the possible causes listed above. If the issue is not resolved, it may be necessary to replace the entire intake system or perform an ECU adaptation.
It is worth noting that BMW generally authorizes goodwill repairs for this code under certain circumstances, such as if the vehicle is still under warranty or certified pre-owned. Therefore, it is recommended to speak with the Dealer GM if the service manager is not willing to perform the repair.
Overall, the P112F code can be a frustrating issue for BMW owners to deal with. However, with proper diagnosis and repair, the issue can be resolved and the vehicle can return to optimal performance.