BMW P1139 Code:O2 Sensor Heater Circuit High Voltage Bank 1 Sensor 2
As a car owner, it can be frustrating to see a warning light pop up on your dashboard. One of the most common issues that BMW owners face is the P1139 code. This diagnostic trouble code (DTC) is associated with the O2 sensor heater circuit high voltage bank 1 sensor 2. If you’re experiencing this issue, you may be wondering what it means, what causes it, and how to fix it. In this article, we’ll dive into the details of the BMW P1139 code and provide expert advice on how to resolve this issue.
What Does BMW P1139 Code Mean?
BMW P1139 Code is a diagnostic trouble code (DTC) that indicates an issue with the O2 sensor heater circuit in Bank 1 Sensor 2 of a BMW vehicle. This code specifically refers to a high voltage reading from the O2 sensor heater circuit, which is responsible for heating up the sensor to ensure accurate readings. When the voltage is too high, it can cause the sensor to malfunction and provide incorrect readings to the engine control module (ECM). This can lead to a variety of issues, including decreased fuel efficiency, poor engine performance, and increased emissions. It is important to address this code promptly to avoid further damage to the vehicle and ensure proper functioning of the O2 sensor.
Signs and Symptoms of BMW P1139 Code
When the BMW P1139 code appears, it indicates that there is a problem with the O2 sensor heater circuit in bank 1 sensor 2. This can cause a range of symptoms that can affect the performance and drivability of your BMW. Here are some of the most common signs and symptoms of the BMW P1139 code:
- Check Engine Light: The most obvious symptom of the BMW P1139 code is the illumination of the check engine light on your dashboard. This light will stay on until the issue is resolved.
- Poor Fuel Economy: A faulty O2 sensor can cause your BMW to consume more fuel than usual, leading to poor fuel economy and higher costs at the pump.
- Engine Misfires: If the O2 sensor is not functioning properly, it can cause the engine to misfire, leading to rough idling and poor acceleration.
- Reduced Power: A faulty O2 sensor can also cause your BMW to lose power, making it difficult to accelerate or climb hills.
- Failed Emissions Test: If the O2 sensor is not working correctly, it can cause your BMW to fail an emissions test, which is required in many states.
If you notice any of these symptoms in your BMW, it is important to have it checked by a qualified mechanic as soon as possible. Ignoring the issue can lead to further damage to your vehicle and higher repair costs down the line. A mechanic will be able to diagnose the problem and recommend the best course of action to fix it. This may involve replacing the O2 sensor or repairing the heater circuit, depending on the root cause of the issue.
Possible Causes of BMW P1139 Code
The BMW P1139 code is related to the O2 sensor heater circuit high voltage bank 1 sensor 2. This code indicates that there is a problem with the O2 sensor heater circuit, which is responsible for heating up the sensor to ensure accurate readings. Here are some of the possible causes of the BMW P1139 code:
- Faulty O2 sensor: The most common cause of the BMW P1139 code is a faulty O2 sensor. If the sensor is not working properly, it can send incorrect signals to the engine control module (ECM), which can cause the code to appear.
- Wiring issues: Another possible cause of the BMW P1139 code is wiring issues. If there is a problem with the wiring that connects the O2 sensor to the ECM, it can cause the sensor to malfunction and trigger the code.
- Failed ECM: In some cases, the ECM itself may be the cause of the BMW P1139 code. If the ECM is not functioning properly, it may not be able to receive or interpret the signals from the O2 sensor correctly.
- Blown fuse: A blown fuse in the O2 sensor circuit can also cause the BMW P1139 code to appear. If the fuse is blown, the sensor will not receive power, and it will not be able to function properly.
- Exhaust leaks: Exhaust leaks can also cause the BMW P1139 code to appear. If there is a leak in the exhaust system, it can cause the O2 sensor to malfunction and send incorrect signals to the ECM.
If you are experiencing the BMW P1139 code, it is important to have your vehicle inspected by a qualified mechanic. They will be able to diagnose the problem and recommend the appropriate repairs. Ignoring the code can lead to further damage to your vehicle and potentially costly repairs down the line.
Fixes for BMW P1139 Code
The P1139 code in BMW vehicles indicates a problem with the O2 sensor heater circuit high voltage bank 1 sensor 2. This issue can cause a variety of symptoms, including poor fuel economy, rough idling, and decreased engine performance. Fortunately, there are several fixes that can help resolve this issue.
1. Replace the O2 Sensor
One of the most common fixes for the P1139 code is to replace the faulty O2 sensor. This sensor is responsible for measuring the amount of oxygen in the exhaust gases and sending this information to the engine control module (ECM). A malfunctioning sensor can cause the ECM to receive incorrect data, leading to a variety of issues.
2. Check the Wiring and Connections
Another potential cause of the P1139 code is damaged wiring or connections in the O2 sensor circuit. This can cause the sensor to malfunction and send incorrect data to the ECM. Checking the wiring and connections and repairing any damage can help resolve this issue.
3. Replace the ECM
In some cases, the P1139 code may be caused by a malfunctioning ECM. If this is the case, replacing the ECM may be necessary to resolve the issue.
4. Clean or Replace the Catalytic Converter
A malfunctioning catalytic converter can also cause the P1139 code to appear. This component is responsible for converting harmful exhaust gases into less harmful emissions. If the catalytic converter is clogged or damaged, it can cause the O2 sensor to malfunction and trigger the P1139 code. Cleaning or replacing the catalytic converter can help resolve this issue.
5. Check the Fuel System
Finally, issues with the fuel system can also cause the P1139 code to appear. Checking the fuel system for clogs, leaks, or other issues can help identify and resolve the problem.
In conclusion, the P1139 code in BMW vehicles can be caused by a variety of issues, including a faulty O2 sensor, damaged wiring or connections, a malfunctioning ECM, a clogged or damaged catalytic converter, or issues with the fuel system.
How Much Will It Take to Fix BMW P1139 Code?
The cost of fixing the BMW P1139 code can vary depending on the severity of the issue and the type of repair needed. In general, the cost can range from $100 to $500 or more. If the problem is simply a faulty O2 sensor, the cost may be on the lower end of the spectrum. However, if the issue is related to the wiring or other components of the sensor, the cost may be higher.
It’s important to note that ignoring the P1139 code can lead to further damage to your BMW’s engine and emissions system. This can result in even higher repair costs down the line. It’s best to address the issue as soon as possible to avoid any additional damage.
If you’re not comfortable diagnosing and repairing the issue yourself, it’s recommended to take your BMW to a certified mechanic or dealership. They can properly diagnose the issue and provide an accurate estimate for the cost of repairs.
Possible Causes and Fixes of Code P1139 for BMW Vehicles
| Possible Cause | Fix | Cost to Fix |
|---|---|---|
| Faulty O2 Sensor Heater Circuit | Replace O2 sensor | $150-$300 |
| Wiring Issues | Repair or replace wiring | $100-$200 |
| Faulty PCM | Replace PCM | $500-$1000 |
| Failed Fuse or Relay | Replace fuse or relay | $10-$50 |
Preventing BMW P1139 Code
The BMW P1139 Code is a common issue that can cause problems for BMW owners. Fortunately, there are several preventive measures that can be taken to avoid this problem. Here are some of the most effective ways to prevent the BMW P1139 Code:
- Regular Maintenance: One of the most important preventive measures is to ensure that your BMW is regularly maintained. This includes regular oil changes, tune-ups, and inspections. Regular maintenance can help prevent issues with the O2 sensor and other components of your vehicle.
- Use High-Quality Fuel: Using high-quality fuel can help prevent issues with the O2 sensor. Low-quality fuel can cause deposits to build up on the sensor, which can lead to problems with the sensor’s performance.
- Replace Faulty Parts: If you notice any issues with your BMW, such as a check engine light or poor performance, it’s important to have the vehicle inspected by a qualified mechanic. Faulty parts, such as a faulty O2 sensor, can cause the BMW P1139 Code to appear.
- Drive Responsibly: Driving your BMW responsibly can help prevent issues with the O2 sensor. Avoid aggressive driving, which can cause the sensor to malfunction. Additionally, avoid driving in extreme temperatures, which can also cause issues with the sensor.
- Keep Your BMW Clean: Keeping your BMW clean can help prevent issues with the O2 sensor. Dirt and debris can build up on the sensor, which can cause it to malfunction. Regular cleaning can help prevent this from happening.
In conclusion, the BMW P1139 Code can be prevented by taking several preventive measures. Regular maintenance, using high-quality fuel, replacing faulty parts, driving responsibly, and keeping your BMW clean are all effective ways to prevent this issue. By following these preventive measures, you can help ensure that your BMW runs smoothly and avoid costly repairs in the future.
How Serious is the BMW P1139 Code?
The BMW P1139 code is a serious issue that should not be ignored. This code indicates that there is a problem with the O2 sensor heater circuit in bank 1 sensor 2. The O2 sensor is responsible for measuring the amount of oxygen in the exhaust gases and sending this information to the engine control module (ECM). The ECM uses this information to adjust the air/fuel mixture to ensure optimal engine performance and reduce emissions.
If the O2 sensor heater circuit is not functioning properly, it can cause a variety of issues. The engine may run poorly, have reduced power, and may even stall. Additionally, the vehicle may fail an emissions test, which can result in fines and penalties.
It is important to address the BMW P1139 code as soon as possible to prevent further damage to the vehicle. Ignoring this code can lead to more serious issues, such as damage to the catalytic converter or other engine components. It is recommended to have the vehicle diagnosed and repaired by a qualified mechanic to ensure proper functioning of the O2 sensor heater circuit and prevent any further damage to the vehicle.
Can You Still Drive with the BMW P1139 Code?
If your BMW is showing the P1139 code, it means that there is an issue with the O2 sensor heater circuit in bank 1 sensor 2. This can cause a variety of symptoms, including poor fuel economy, rough idling, and decreased engine performance. However, the question remains: can you still drive your BMW with this code?
The answer is that it depends on the severity of the issue. If your BMW is still running smoothly and you are not experiencing any noticeable symptoms, you may be able to continue driving it for a short period of time. However, it is important to note that driving with a faulty O2 sensor can cause damage to your engine over time, so it is best to have the issue addressed as soon as possible.
If you are experiencing symptoms such as decreased performance or rough idling, it is recommended that you avoid driving your BMW until the issue has been resolved. Continuing to drive with a faulty O2 sensor can cause further damage to your engine and may result in costly repairs down the line.
In conclusion, while it may be possible to continue driving your BMW with the P1139 code, it is not recommended. It is best to have the issue addressed as soon as possible to avoid further damage to your vehicle.
Conclusion
If you are experiencing the BMW P1139 Code, it is important to address the issue promptly to avoid further damage to your vehicle. The code indicates a problem with the O2 sensor heater circuit high voltage bank 1 sensor 2. The causes of this issue can range from a faulty sensor to a damaged wiring harness. Symptoms may include poor fuel economy, rough idling, and decreased engine performance. To fix the problem, you may need to replace the sensor or repair the wiring. It is recommended to seek the advice of a professional mechanic to properly diagnose and resolve the issue.
FAQ
What is BMW P1139 Code?
BMW P1139 Code is a diagnostic trouble code (DTC) that indicates an issue with the O2 sensor heater circuit high voltage bank 1 sensor 2 in BMW vehicles.
What are the causes of BMW P1139 Code?
The causes of BMW P1139 Code can include a faulty O2 sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning engine control module (ECM).
What are the symptoms of BMW P1139 Code?
The symptoms of BMW P1139 Code can include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.
How is BMW P1139 Code diagnosed?
BMW P1139 Code is diagnosed using an OBD-II scanner that can read the DTCs stored in the vehicle’s ECM. The mechanic will then perform a visual inspection of the O2 sensor and its wiring and connectors to determine the cause of the issue.
Can I drive my BMW with P1139 Code?
It is not recommended to drive your BMW with P1139 Code as it can cause damage to the engine and reduce fuel efficiency. It is best to have the issue diagnosed and repaired as soon as possible.
How is BMW P1139 Code fixed?
The fix for BMW P1139 Code can vary depending on the cause of the issue. It may involve replacing the O2 sensor, repairing damaged wiring or connectors, replacing a blown fuse, or replacing the ECM.
Can I fix BMW P1139 Code myself?
It is not recommended to attempt to fix BMW P1139 Code yourself unless you have experience working on vehicles and have the necessary tools and equipment. It is best to have the issue diagnosed and repaired by a qualified mechanic.
Learn about other similar BMW Fault Codes from our BMW OBD 2 Fault Code List.