The P112f BMW error code is a very common Diagnostic Trouble Code (DTC) issue that most BMW owners may face. This Code simply suggests that the Manifold Absolute Pressure to Throttle Angle is too high on the Bank 1.

This error code can caused by many reasons like a broken Manifold Absolute Pressure(MAP) Sensor, poor electric connection in the Manifold Absolute Pressure Sensor, or a damaged hose in the system.

When this error code shows it indicates many problems with your car’s overall performance, like decreased fuel efficiency, and also less power and acceleration, and much more.

Luckily, there are many solutions related to this code. So, just relax and take a deep drive in this article.

The P112f BMW Code Meaning

The P112f is a Diagnostic Trouble Code (DTC) which represents any trouble/error in your car. Often this is caused by faulty vacuum lines.

This code is acknowledged when the relationship between the indicated intake manifold absolute pressure sensor(MAP) and the mass airflow calculated based on the throttle-valve angle is not correct.

This P112f code gets triggered when the Engine Control Module (ECM) detects any fault in the manifold absolute pressure(MAP) sensor. Then the ECM will store this code in its system and highlight the check engine light. (or Service Engine Soon Warning Light)

The P112f code is a specific code for Bank 1. The Bank 1 is simply the number one cylinder. Which means it’s the bank where the number one cylinder is located. And, this code indicates that there is an issue with the MAP sensor’s connection with Bank 1.

This BMW code is a general code, which means every model of BMW has this. But, the cause and symptoms may vary depending on the car.

So, let’s check out the Causes and Symptoms of this Code.

Brief Of BMW P112f Code

This is a brief of the P112f BMW code.

Meaning: The Manifold Absolute Pressure to Throttle Angle is Too High on the Bank 1.

Seriousness: Moderate

Can You Drive: Not recommended

DIY Skill Level: Intermediate-Difficult

Common Symptoms

When a vehicle indicates the P112f code there can be many different symptoms that can have a major effect on the performance of the vehicle.

Here are the most common symptoms regarding the P112f code:

1. Illuminated Check Engine Light: The most common symptom for this code is the illuminated Check Engine Light or Service Engine Soon Warning Light on the vehicle dashboard. It is a crucial indicator of potential problems within the engine or emission system. And, it requires urgent attention from the owner. This light works as a warning system in the car.
2. Decreased Engine Performance: The vehicle’s overall engine performance might decrease at a noticeable rate. You might notice reduced engine power, acceleration, and difficulty in maintaining a steady speed while driving.
3. Hesitation or Stalling: The engine might hesitate or stall while accelerating, and give uneven power thrust. Sometimes the engine shuts off completely while driving.
4. Poor Fuel Economy: This code refers to trouble with the engine or emission system, which means the fuel combustion system may not working properly. Which will result in poor fuel economy and refueling more frequently. (Which will put a big hole in your pocket)
5. Rough Driving: Another common symptom is that the vehicle can be pretty rough while driving, and irregular while the engine idle with running roughly/unsteadily.
6. Throttle Problem: While throttling, it may have a delayed or non-throttle response. Which will be very easy to identify.

Remember these symptoms are general for the P112f code and every vehicle is different so you may or may not suspect any of these symptoms.

If you suspect any of the following symptoms, it is very important to get your vehicle inspected by a professional technician to quickly resolve this issue.

Also Read: How To Turn Off Air Suspension On The BMW X5?

The Causes For the P112F Code

The P112f Bmw code refers to the problem with the Manifold Absolute Pressure Sensor(MAP) or Throttle Angle/Body.

There can be many reasons for the P112f code, but here are some common causes for the P112f DTC:

1. Malfunction on Throttle Position Sensor: The throttle position sensor(TPS) provides information about the throttle to the Engine Control Module. A malfunction in the TPS can potentially lead to the P112f code.
2. Faulty Intake Pipe Vacuum Sensor: If the intake pipe vacuum sensor is faulty, then the MAP will provide wrong information to the Engine Control Module(ECM). Which will eventually trigger the P112f code.
3. Faulty Throttle Body: The throttle body may have issues such as a malfunctioning throttle plate or a stuck, which will lead to the P112f code being triggered.
4. Poor electrical connection in the Intake Pipe Vacuum Sensor circuit: A problem in the electrical connection in the pipe vacuum sensor circuit can cause the sensor to provide wrong information to the ECM, which will trigger the code.
5. Leaks on the Vacuum: Due to vacuum leaks unmetered air can intake into the engine, and cause trouble in the proper functioning of the throttle system. Which can trigger the P112f code.
6. Intake Pipe Vacuum Sensor Harness Problem: If the Intake Pipe Vacuum Sensor harness is open or shorted, it can cause malfunction and trigger the P112f code.

Diagnosis And Solutions

The diagnosis can be done by yourself and obviously, you can seek professional help. The self-diagnosis is very time intensive, you have to spend at least 1 hour doing the diagnosis. Here are the DIY diagnosis steps and their solutions:

DIY Diagnosis:

• Diagnostic Scanning: You can take an OBD-II scanner compatible with your vehicle extract the exact trouble code, and get more information on the root cause.
• Inspection of Wiring and Connectors: After using the diagnosing scanner, carefully inspect for damaged or faulty connectors in the throttle control system.
• Throttle Body Inspection: Now check the throttle body for any type of malfunctioning in the throttle body, such as Throttle Plate Misalignment, stuck throttle plate, or Worn bushings or bearings supporting the throttle shaft.
• Throttle Position Sensor: Inspect the throttle position sensor if it is giving accurate readings. Then inspect the intake manifold sensor, and intake air temperature sensor for any type of damage.
• Intake Air Leaks: This is mostly the common issue for the code, leak in the intake air system. To inspect leakage in the intake, the best way is to do a smoke test. Conduct the smoke test by connecting a smoke machine to the intake and looking for any leakage.

I hope after doing these diagnoses you will be able to identify the root cause of this error code.

Now if you are comfortable working on your vehicle then follow the manufacturer’s instructions and the proper tools/equipment to make the necessary repairs yourself.

DIY Solution:

• Repair or Change the Wiring: If any damaged wiring or connector is discovered, try to repair it(if you can) or just replace it.
• Throttle Body Repairing: First Remove all the carbon deposits and dirt from the throttle body system. Use a throttle body cleaner to carefully clean the throttle plate, and see if the P112f code issue is resolved. If the throttle body is damaged you may have to replace the throttle body.
• Replace The Throttle Position Sensor: While inspecting if the Throttle Position Sensor(TPS) is found damaged/faulty, then replace the TPS. And check if the error code is resolved.
• Repair Vaccum leaks: If there’s any vacuum leak in the intake air system, you should quickly fix the damaged hoses or change the gasket.
• Test: After making all the necessary repairs or replacements, use the OBD-II scanner to clear the faulty codes and retest the vehicle to see if the issue is resolved. Then take a test drive and see if everything is normal.

In my experience vacuum leak is the major cause behind the P112f code issue, so if this is also the case with you then I’m attaching a video below which may help you fix that issue.

Professional Diagnosis And Solutions

If you’re not that comfortable and have the time to diagnose and repair all by yourself, or after the self-diagnosis and repairs the issue still persists. Then It is recommended that you seek professional help from a certified BMW mechanic or contact your BMW dealership.

We will highly recommend if you don’t have much knowledge one Diagnosis and repair, you should seek professional help from a qualified mechanic.

They have much better and more specialized tools(and experience) to diagnose and repair more complex issues.

The mechanic will perform several diagnosis tests to determine the root cause.

And after determining the root cause they will give you a detailed report on the required repairs and their estimated costs.

Preventing The P112f BMW Code Issue

• Maintainance: Regular or frequent maintenance is a very good way to prevent issues like the P112f code. Inspect the air intake system for any type of leaks or damages which can cause a vacuum leak.

Frequently check the throttle body system so the throttle plate doesn’t get dirty and get sticky. You should also practice oil changes, and air filter replacement as per the manufacturer’s guide.

• High-Quality Fuel: Use quality fuel to prevent any issue with the fuel system components, higher quality fuel means smooth engine performance and less or fewer deposits in the fuel system.
• Air intake System: Check the air intake system often for any type of obstacle or damage, which can lead to trouble in the engine performance.
• Software Update: Keep the BMW software up-to-date. Companies release software updates to better their system in finding and addressing overall performance issues.

These are the basic steps you can take to prevent any issue in the future. The engine is the main component of any vehicle, to keep it running smoothly, we have to take the necessary steps to prevent it from any type of trouble, like the P112f code.

Conclusion

The P112f BMW code is the Manifold Absolute Pressure to Throttle Angle is Too High on the Bank 1. This code can be the reason for many issues from Faulty Throttle Body to air intake leaks.

While performing the diagnosis it is very important to visually check every component related to it and repair or replace the faulty/damaged part. If you are not comfortable doing the self-diagnosis mentioned above, it is advised to seek professional help.

You can talk to your BMW Authorised dealer about this issue, they will surely advise you with the best repair option.

This P112f code can be a very frustrating issue for every BMW owner, so it is better to have a professional diagnosis and repair so the vehicle can return to its peak performance days.

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