BMW P1155 Code:O2 Sensor Heater Circuit Intermittent Bank 2 Sensor 2
As a car owner, it’s important to be aware of any diagnostic trouble codes (DTCs) that may appear on your BMW’s dashboard. One such code is the P1155 code, which is associated with the O2 sensor heater circuit intermittent bank 2 sensor 2. If you’re experiencing this issue, it’s essential to understand the meaning, causes, symptoms, and fixes for this code. In this article, we’ll dive into all of these aspects to help you troubleshoot and resolve the problem.
BMW P1155 Code: Meaning, Causes, Symptoms and Fixes
The BMW P1155 code is a diagnostic trouble code (DTC) that indicates an issue with the O2 sensor heater circuit in bank 2 sensor 2 of the vehicle. This code is triggered when the powertrain control module (PCM) detects an intermittent or insufficient voltage signal from the O2 sensor heater circuit. The O2 sensor is responsible for measuring the amount of oxygen in the exhaust gases and providing feedback to the PCM to adjust the air/fuel ratio for optimal engine performance. A faulty O2 sensor heater circuit can cause the engine to run rich or lean, resulting in poor fuel economy, reduced power, and increased emissions. Common causes of the P1155 code include a faulty O2 sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning PCM. Symptoms of this code may include a check engine light, rough idle, poor acceleration, and decreased fuel efficiency. To fix the issue, the O2 sensor heater circuit should be inspected and repaired or replaced as necessary.
Signs and Symptoms of BMW P1155 Code
When the check engine light comes on in your BMW, it can be a sign of a variety of issues. One of the most common codes that BMW owners encounter is the P1155 code. This code indicates an issue with the O2 sensor heater circuit on bank 2 sensor 2. Here are some of the signs and symptoms that you may experience if your BMW is displaying the P1155 code:
- Check engine light: The most obvious sign of the P1155 code is the check engine light coming on. This light can be triggered by a variety of issues, but if you see the P1155 code specifically, it’s likely related to the O2 sensor heater circuit.
- Poor fuel economy: If your BMW is experiencing issues with the O2 sensor heater circuit, it may not be running as efficiently as it should. This can lead to poor fuel economy and higher gas bills.
- Rough idling: A faulty O2 sensor can cause your BMW to idle roughly or even stall out. This can be a dangerous issue if it happens while you’re driving.
- Reduced power: If your BMW is experiencing issues with the O2 sensor heater circuit, it may not be running at full power. This can make it difficult to accelerate or climb hills.
- Failed emissions test: If you live in an area that requires emissions testing, a faulty O2 sensor can cause your BMW to fail the test. This can lead to fines or even a suspension of your registration.
If you’re experiencing any of these symptoms, it’s important to get your BMW checked out by a qualified mechanic. Ignoring the P1155 code can lead to more serious issues down the line, so it’s best to address the problem as soon as possible. Your mechanic will be able to diagnose the issue and recommend the best course of action to get your BMW running smoothly again.
Possible Causes of BMW P1155 Code
The BMW P1155 code is related to the O2 sensor heater circuit intermittent bank 2 sensor 2. This code indicates that there is an issue 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 P1155 code:
- Faulty O2 Sensor: A faulty O2 sensor is one of the most common causes of the P1155 code. If the sensor is not working properly, it will not be able to provide accurate readings, which can lead to a variety of issues.
- Wiring Issues: Wiring issues can also cause the P1155 code. If there is a problem with the wiring, the sensor may not be getting the power it needs to function properly.
- Faulty PCM: The PCM (powertrain control module) is responsible for controlling the O2 sensor heater circuit. If the PCM is faulty, it may not be able to properly control the circuit, which can lead to the P1155 code.
- Blown Fuse: A blown fuse can also cause the P1155 code. If the fuse that controls the O2 sensor heater circuit is blown, the sensor will not be able to function properly.
- Exhaust Leak: An exhaust leak can also cause the P1155 code. If there is a leak in the exhaust system, it can cause the O2 sensor to malfunction, which can lead to the code.
- Failed Catalytic Converter: A failed catalytic converter can also cause the P1155 code. If the converter is not working properly, it can cause the O2 sensor to malfunction, which can lead to the code.
If you are experiencing the P1155 code, it is important to have your vehicle inspected by a qualified mechanic. They will be able to diagnose the issue and provide you with the necessary repairs to get your vehicle back on the road. Ignoring the code can lead to further damage to your vehicle and potentially more expensive repairs down the line.
Fixes for BMW P1155 Code
The P1155 code in BMW vehicles indicates an issue with the O2 sensor heater circuit in bank 2 sensor 2. This can cause a variety of problems, including decreased fuel efficiency, rough idling, and even engine damage if left untreated. Fortunately, there are several fixes that can help resolve this issue.
1. Replace the O2 sensor
One of the most common fixes for the P1155 code is to replace the faulty O2 sensor. This can be done by a mechanic or DIY if you have the necessary tools and knowledge. It’s important to use a high-quality replacement sensor to ensure proper function and longevity.
2. Check the wiring and connections
Sometimes, the issue may not be with the sensor itself but with the wiring or connections leading to it. Check for any frayed or damaged wires, loose connections, or corrosion. Repair or replace as necessary.
3. Inspect the fuse and relay
The O2 sensor heater circuit is often controlled by a fuse or relay. Check these components to ensure they are functioning properly. Replace any blown fuses or faulty relays.
4. Clean or replace the catalytic converter
A clogged or dirty catalytic converter can cause issues with the O2 sensor and trigger the P1155 code. Try cleaning the converter first, but if that doesn’t work, it may need to be replaced.
5. Check for vacuum leaks
Vacuum leaks can also cause issues with the O2 sensor and trigger the P1155 code. Check for any leaks in the vacuum system and repair as necessary.
In conclusion, the P1155 code in BMW vehicles can be a frustrating issue to deal with, but there are several fixes that can help resolve the problem. Whether it’s replacing the O2 sensor, checking the wiring and connections, inspecting the fuse and relay, cleaning or replacing the catalytic converter, or checking for vacuum leaks, there are several steps you can take to troubleshoot and resolve the issue.
How Much Will It Take to Fix BMW P1155 Code?
If you’re experiencing the P1155 code on your BMW, you may be wondering how much it will cost to fix the issue. The cost of fixing the code can vary depending on the root cause of the problem and the severity of the issue.
In general, the cost of fixing the P1155 code can range from $100 to $500. The cost may be higher if you take your vehicle to a dealership or a certified mechanic. However, if you have some knowledge of car repairs, you may be able to fix the issue yourself by replacing the faulty O2 sensor or repairing the wiring.
It’s important to note that ignoring the P1155 code can lead to more serious problems with your vehicle, such as decreased fuel efficiency and engine damage. Therefore, it’s recommended to address the issue as soon as possible to avoid further damage and costly repairs.
In conclusion, the cost of fixing the P1155 code on your BMW can vary depending on the severity of the issue and the repair method you choose. It’s best to consult with a professional mechanic to determine the best course of action for your specific situation.
Possible Causes and Fixes of Code P1155 for BMW Vehicles
| Possible Cause | Fix | Cost to Fix |
|---|---|---|
| Faulty O2 sensor heater circuit | Replace the faulty O2 sensor | $200-$500 |
| Wiring issues in the O2 sensor heater circuit | Repair or replace the damaged wiring | $100-$300 |
| Faulty PCM (Powertrain Control Module) | Replace the faulty PCM | $500-$1000 |
| Issues with the fuel system | Check and repair any issues with the fuel system | Cost varies depending on the issue |
| Issues with the exhaust system | Check and repair any issues with the exhaust system | Cost varies depending on the issue |
Preventing BMW P1155 Code: Tips and Tricks
If you own a BMW vehicle, you may have encountered the P1155 code, which indicates an O2 sensor heater circuit intermittent bank 2 sensor 2 issue. This code can be frustrating and costly to fix, but there are some preventive measures you can take to avoid it. Here are some tips and tricks to prevent the BMW P1155 code:
1. Regular Maintenance
One of the best ways to prevent the P1155 code is to keep up with your vehicle’s regular maintenance. This includes changing the oil and air filters, checking the spark plugs, and inspecting the O2 sensors. By doing so, you can catch any potential issues before they become major problems.
2. Use High-Quality Fuel
Using high-quality fuel can also help prevent the P1155 code. Low-quality fuel can cause deposits to build up in the engine, which can lead to sensor issues. By using high-quality fuel, you can reduce the risk of these deposits forming and keep your engine running smoothly.
3. Avoid Short Trips
Short trips can also contribute to the P1155 code. When you take short trips, your engine may not have enough time to warm up fully, which can cause the O2 sensors to malfunction. To prevent this, try to combine your errands into one trip or take longer drives to give your engine time to warm up.
4. Check the Wiring
Another way to prevent the P1155 code is to check the wiring regularly. Over time, the wiring can become damaged or corroded, which can cause sensor issues. By inspecting the wiring and repairing any damage, you can prevent the P1155 code from occurring.
5. Replace the O2 Sensors
Finally, if you have an older BMW vehicle, it may be time to replace the O2 sensors. Over time, these sensors can wear out and malfunction, which can cause the P1155 code. By replacing the sensors, you can prevent this issue from occurring and keep your vehicle running smoothly.
How Serious is the BMW P1155 Code?
The BMW P1155 code is a moderately serious issue that should not be ignored. This code indicates that there is an issue with the O2 sensor heater circuit in bank 2 sensor 2. The O2 sensor is responsible for measuring the amount of oxygen in the exhaust system and providing feedback to the engine control module (ECM) to adjust the air/fuel mixture. The heater circuit is responsible for warming up the O2 sensor quickly to ensure accurate readings.
If the O2 sensor heater circuit is intermittent, it can cause a variety of problems, including reduced fuel efficiency, increased emissions, and poor engine performance. In some cases, the vehicle may even fail an emissions test or trigger the check engine light.
It is important to address the BMW P1155 code as soon as possible to prevent further damage to the vehicle and ensure optimal performance. A qualified mechanic or dealership can diagnose the issue and recommend the appropriate repairs to fix the O2 sensor heater circuit problem.
Can You Still Drive with the BMW P1155 Code?
If your BMW is showing the P1155 code, it means that there is an issue with the O2 sensor heater circuit in bank 2 sensor 2. While this issue may not cause immediate harm to your vehicle, it is not recommended to continue driving with the code present.
The O2 sensor is responsible for monitoring the amount of oxygen in the exhaust system and providing feedback to the engine control module (ECM) to adjust the air/fuel mixture. If the O2 sensor is not functioning properly, it can cause a decrease in fuel efficiency and potentially damage the catalytic converter.
Driving with the P1155 code present can also cause your vehicle to fail emissions tests, which may result in fines or penalties. It is best to address the issue as soon as possible to avoid any further damage to your vehicle and ensure it is running efficiently.
If you are unsure of how to troubleshoot or fix the issue yourself, it is recommended to take your BMW to a certified mechanic or dealership for proper diagnosis and repair.
Conclusion
If you are experiencing the BMW P1155 code, it is important to address the issue promptly to avoid further damage to your vehicle. The code indicates an O2 sensor heater circuit intermittent bank 2 sensor 2 problem, which can cause poor fuel economy and emissions. The causes of the issue can range from a faulty sensor to a damaged wiring harness. It is recommended to have a professional mechanic diagnose and repair the problem to ensure proper resolution. By addressing the issue promptly, you can ensure your BMW runs smoothly and efficiently for years to come.
FAQ
What is the meaning of BMW P1155 code?
BMW P1155 code is a diagnostic trouble code (DTC) that indicates an O2 sensor heater circuit intermittent issue in bank 2 sensor 2.
What are the possible causes of BMW P1155 code?
The possible causes of BMW P1155 code include a faulty O2 sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning PCM.
What are the symptoms of BMW P1155 code?
The symptoms of BMW P1155 code may include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.
How can I diagnose BMW P1155 code?
You can diagnose BMW P1155 code by using an OBD-II scanner to retrieve the code and then inspecting the O2 sensor, wiring, and connectors for any damage or issues.
Can I still drive my BMW with P1155 code?
It is not recommended to drive your BMW with P1155 code as it can cause further damage to the engine and reduce fuel efficiency.
How can I fix BMW P1155 code?
You can fix BMW P1155 code by replacing the faulty O2 sensor, repairing or replacing any damaged wiring or connectors, replacing the blown fuse, or repairing or replacing the malfunctioning PCM.
Do I need a mechanic to fix BMW P1155 code?
While it is possible to fix BMW P1155 code on your own, it is recommended to seek the help of a qualified mechanic or dealership to ensure proper diagnosis and repair.
Learn about other similar BMW Fault Codes from our BMW OBD 2 Fault Code List.