BMW P1173 Code:Ambient Pressure Sensor Rationality Check
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 drivers face is the P1173 code. This diagnostic trouble code (DTC) can indicate a problem with the ambient pressure sensor in your vehicle. If you’re experiencing this issue, it’s important to understand the meaning, causes, symptoms, and fixes for the BMW P1173 code. In this article, we’ll provide expert guidance to help you resolve the issue and get back on the road with confidence.
What Does the BMW P1173 Code Mean?
The BMW P1173 code refers to a diagnostic trouble code (DTC) that indicates a problem with the ambient pressure sensor rationality check. This sensor is responsible for measuring the atmospheric pressure outside the vehicle and providing this information to the engine control module (ECM). The ECM uses this data to adjust the air/fuel mixture and ignition timing for optimal engine performance. When the ambient pressure sensor rationality check fails, it means that the ECM has detected a discrepancy between the expected and actual sensor readings. This can lead to a variety of symptoms, including poor fuel economy, reduced engine power, and increased emissions. It is important to address this issue promptly to prevent further damage to the vehicle and ensure safe operation.
Signs and Symptoms of BMW P1173 Code
The BMW P1173 code is a diagnostic trouble code that indicates a problem with the ambient pressure sensor rationality check. This code is usually accompanied by a check engine light on the dashboard. Here are some of the signs and symptoms that you may experience if your BMW has the P1173 code:
- Check engine light: The most common symptom of the P1173 code is the check engine light on the dashboard. This light may come on and stay on, or it may flash intermittently.
- Poor engine performance: Another symptom of the P1173 code is poor engine performance. You may notice that your BMW is running rough, misfiring, or stalling. The engine may also be sluggish and unresponsive.
- Reduced fuel efficiency: The P1173 code can also cause reduced fuel efficiency. You may notice that your BMW is using more fuel than usual, or that you need to fill up more frequently.
- Difficulty starting: In some cases, the P1173 code can make it difficult to start your BMW. You may need to crank the engine several times before it starts, or it may not start at all.
- Other codes: The P1173 code may also be accompanied by other codes, such as the P0171 or P0174 codes, which indicate a lean fuel mixture.
If you are experiencing any of these symptoms, it is important to have your BMW diagnosed and repaired as soon as possible. Ignoring the P1173 code can lead to further damage to your engine and other components, which can be costly to repair. A qualified mechanic can diagnose the problem and recommend the best course of action to fix it.
Possible Causes of BMW P1173 Code
The BMW P1173 code is related to the Ambient Pressure Sensor Rationality Check. This code indicates that the engine control module (ECM) has detected a problem with the ambient pressure sensor circuit. Here are some of the possible causes of the P1173 code:
- Faulty Ambient Pressure Sensor: The most common cause of the P1173 code is a faulty ambient pressure sensor. This sensor is responsible for measuring the atmospheric pressure outside the vehicle and sending this information to the ECM. If the sensor is faulty, it can send incorrect information to the ECM, which can trigger the P1173 code.
- Wiring Issues: Another possible cause of the P1173 code is wiring issues in the ambient pressure sensor circuit. If there is a short circuit or an open circuit in the wiring, it can prevent the sensor from sending accurate information to the ECM.
- ECM Malfunction: In some cases, the P1173 code can be triggered by a malfunctioning ECM. If the ECM is not functioning properly, it may not be able to receive or interpret the information from the ambient pressure sensor correctly.
- Vacuum Leaks: Vacuum leaks in the engine can also cause the P1173 code. If there is a leak in the vacuum system, it can affect the pressure readings in the engine and trigger the code.
- Faulty MAP Sensor: The manifold absolute pressure (MAP) sensor is another sensor that is responsible for measuring the pressure in the engine. If this sensor is faulty, it can send incorrect information to the ECM and trigger the P1173 code.
- Failed PCM: In rare cases, the P1173 code can be caused by a failed powertrain control module (PCM). If the PCM is not functioning properly, it may not be able to receive or interpret the information from the ambient pressure sensor correctly.
If you are experiencing the P1173 code in your BMW, it is important to have the issue diagnosed and repaired as soon as possible. Ignoring the code can lead to further damage to your vehicle and potentially costly repairs.
Fixes for BMW P1173 Code
The BMW P1173 code is related to the ambient pressure sensor rationality check. This code indicates that the engine control module (ECM) has detected a problem with the ambient pressure sensor circuit. Here are some of the fixes for this code:
- Replace the ambient pressure sensor: The most common fix for the P1173 code is to replace the ambient pressure sensor. This sensor is responsible for measuring the atmospheric pressure and sending the information to the ECM. If the sensor is faulty, it can cause the ECM to detect an error and trigger the P1173 code.
- Check the wiring and connections: Sometimes, the problem may not be with the sensor itself, but with the wiring or connections. Check the wiring and connections for any damage, corrosion, or loose connections. Repair or replace any damaged components as necessary.
- Check the vacuum lines: The ambient pressure sensor is connected to the intake manifold via a vacuum line. If there is a leak in the vacuum line, it can cause the sensor to malfunction and trigger the P1173 code. Check the vacuum lines for any leaks or damage and repair or replace them as necessary.
- Check the ECM: In rare cases, the problem may be with the ECM itself. If all other components have been checked and are functioning properly, it may be necessary to replace the ECM to resolve the P1173 code.
- Reset the ECM: After any repairs have been made, it is important to reset the ECM to clear the code and see if the problem has been resolved. This can be done using a diagnostic tool or by disconnecting the battery for a few minutes.
In conclusion, the BMW P1173 code can be caused by a variety of issues related to the ambient pressure sensor circuit. The most common fix is to replace the sensor, but it is important to check all other components and connections before doing so. If the problem persists, it may be necessary to replace the ECM. Always remember to reset the ECM after any repairs have been made to clear the code and ensure that the problem has been resolved.
How Much Will It Take to Fix the BMW P1173 Code?
The cost of fixing the BMW P1173 code can vary depending on the root cause of the issue. The P1173 code indicates a problem with the ambient pressure sensor rationality check, which means that the sensor is not providing accurate readings to the engine control module (ECM).
The first step in fixing the issue is to diagnose the root cause of the problem. This may involve checking the wiring and connections to the sensor, testing the sensor itself, or checking the ECM for any faults. Depending on the severity of the issue, the cost of diagnosis can range from $50 to $200.
If the issue is with the sensor itself, the cost of replacement can range from $100 to $300, depending on the make and model of the vehicle. If the issue is with the wiring or connections, the cost of repair can range from $50 to $150.
In some cases, the issue may be more complex and require additional repairs or replacements. It is important to consult with a qualified mechanic to determine the best course of action and estimate the cost of repairs.
Possible Causes and Fixes of Code
| Possible Cause | Fix | Cost to Fix |
|---|---|---|
| Faulty ambient pressure sensor | Replace ambient pressure sensor | $100-$300 |
| Wiring issues in ambient pressure sensor circuit | Repair or replace wiring in ambient pressure sensor circuit | $100-$500 |
| Malfunctioning engine control module (ECM) | Replace ECM | $500-$1000 |
| Incorrect fuel pressure | Check and adjust fuel pressure | $100-$200 |
Preventing the BMW P1173 Code
The BMW P1173 code is a diagnostic trouble code that indicates a problem with the ambient pressure sensor rationality check. To prevent this code from appearing in your BMW vehicle, there are several preventive measures that you can take.
1. Regular Maintenance: Regular maintenance of your BMW vehicle is essential to prevent any issues with the ambient pressure sensor. This includes changing the air filter, cleaning the throttle body, and checking the vacuum hoses for any leaks or cracks. Regular maintenance will ensure that your vehicle is running smoothly and prevent any issues with the ambient pressure sensor.
2. Check the Ambient Pressure Sensor: The ambient pressure sensor is responsible for measuring the atmospheric pressure outside the vehicle. If this sensor is faulty, it can cause the P1173 code to appear. To prevent this, you should regularly check the ambient pressure sensor and replace it if necessary.
3. Check the Wiring: The wiring that connects the ambient pressure sensor to the engine control module can become damaged or corroded over time. This can cause the P1173 code to appear. To prevent this, you should regularly check the wiring and replace any damaged or corroded wires.
4. Use High-Quality Fuel: Using low-quality fuel can cause issues with the ambient pressure sensor and other components of your BMW vehicle. To prevent this, you should always use high-quality fuel that meets the manufacturer’s specifications.
5. Avoid Overloading: Overloading your BMW vehicle can cause issues with the ambient pressure sensor and other components. To prevent this, you should avoid overloading your vehicle and ensure that you are not carrying more weight than the manufacturer’s recommended limit.
How Serious is the BMW P1173 Code?
The BMW P1173 code is a diagnostic trouble code that indicates a problem with the ambient pressure sensor rationality check. This code is not considered to be a serious issue, but it can cause some problems with the vehicle’s performance and fuel efficiency.
When the ambient pressure sensor is not functioning properly, it can cause the engine to run rich or lean, which can lead to decreased fuel efficiency and increased emissions. Additionally, the engine may run rough or stall, and the vehicle may experience a loss of power or acceleration.
While the P1173 code is not a serious issue, it is important to address it as soon as possible to prevent further damage to the vehicle. If left untreated, the problem can lead to more serious issues with the engine and other components of the vehicle.
If you are experiencing problems with your BMW and have received the P1173 code, it is recommended that you take your vehicle to a qualified mechanic for diagnosis and repair. They will be able to identify the root cause of the problem and provide you with the necessary repairs to get your vehicle back on the road in optimal condition.
Can You Still Drive with the BMW P1173 Code?
If your BMW has triggered the P1173 code, it is an indication that there is an issue with the ambient pressure sensor rationality check. This code is usually caused by a faulty sensor or a wiring issue. While it is not recommended to drive your vehicle with a malfunctioning sensor, you may still be able to drive your BMW with the P1173 code.
However, it is important to note that driving with a faulty sensor can lead to other problems and may cause damage to your vehicle. The sensor is responsible for providing important data to your car’s computer, which helps regulate the engine’s performance. If the sensor is not functioning properly, it can cause your engine to run inefficiently, leading to poor fuel economy and reduced performance.
It is always best to have your BMW inspected by a qualified mechanic as soon as possible if you notice any issues with your vehicle. They can diagnose the problem and recommend the best course of action to fix the issue and prevent any further damage to your car.
In conclusion, while you may be able to drive your BMW with the P1173 code, it is not recommended. It is always best to have your vehicle inspected by a professional to ensure that it is running smoothly and efficiently.
Conclusion
If you are experiencing the BMW P1173 code, it is important to understand its meaning, potential causes, symptoms, and fixes. This code indicates an issue with the ambient pressure sensor rationality check, which can lead to various problems with your vehicle’s performance. It is recommended to seek expert guidance to diagnose and resolve the issue, whether you are a BMW owner or mechanic. By addressing the problem promptly, you can ensure the safety and reliability of your BMW and avoid further damage or costly repairs.
FAQ
What does the BMW P1173 code mean?
The BMW P1173 code refers to a rationality check error in the ambient pressure sensor. This means that the sensor is not providing accurate readings, which can affect the performance of the engine.
What are the symptoms of the BMW P1173 code?
The symptoms of the BMW P1173 code may include poor engine performance, reduced fuel efficiency, and difficulty starting the vehicle. In some cases, the check engine light may also be illuminated.
What are the common causes of the BMW P1173 code?
The common causes of the BMW P1173 code may include a faulty ambient pressure sensor, damaged wiring or connectors, or a problem with the engine control module (ECM).
How can I diagnose the BMW P1173 code?
To diagnose the BMW P1173 code, you will need a diagnostic scanner to read the code and identify the underlying issue. You may also need to perform a visual inspection of the sensor and its wiring to check for any damage or corrosion.
Can I still drive my BMW with the P1173 code?
It is not recommended to drive your BMW with the P1173 code as it can affect the performance of the engine and potentially cause further damage. It is best to have the issue diagnosed and repaired as soon as possible.
How can I fix the BMW P1173 code?
The fix for the BMW P1173 code will depend on the underlying issue. It may involve replacing the ambient pressure sensor, repairing damaged wiring or connectors, or replacing the engine control module (ECM).
Do I need a mechanic to fix the BMW P1173 code?
While it is possible to fix the BMW P1173 code yourself, it is recommended to have a qualified mechanic diagnose and repair the issue to ensure that it is done correctly and safely.
Learn about other similar BMW Fault Codes from our BMW OBD 2 Fault Code List.