AutoCodes – BMW – P1172 BMW

P1172 BMW Code - Ambient Pressure Sensor Rationality Check

Quick Answer

P1172 BMW indicates Ambient Pressure Sensor Rationality Check. Common causes include Faulty Ambient Pressure Sensor, Ambient Pressure Sensor harness is open or shorted, Ambient Pressure Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1172 BMW indicates Ambient Pressure Sensor Rationality Check.
Common causes: Common causes include Faulty Ambient Pressure Sensor, Ambient Pressure Sensor harness is open or shorted, Ambient Pressure Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,879

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1172 BMW Description

OBDII Code P1172 BMW - Ambient Pressure Sensor Rationality Check - AutoCodes.com — P1172 BMW Code - Ambient Pressure Sensor Rationality Check

What does this mean?

What are the Possible Causes of the DTC P1172 BMW?

Faulty Ambient Pressure Sensor
Ambient Pressure Sensor harness is open or shorted
Ambient Pressure Sensor circuit poor electrical connection

How to Fix the DTC P1172 BMW?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1172 BMW code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1172 BMW code?

Need more information on how to fix the P1172 BMW code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1172 BMW Code

1. What are the common symptoms of OBDII code P1172 in a BMW related to the Ambient Pressure Sensor Rationality Check?

- Common symptoms include rough idling, decreased engine performance, and potential issues with the vehicle's fuel efficiency.

2. What are the possible causes of OBDII code P1172 in a BMW?

- The code P1172 in a BMW related to the Ambient Pressure Sensor Rationality Check can be caused by a faulty ambient pressure sensor, a vacuum leak, or issues with the engine's air intake system.

3. How can I diagnose the OBDII code P1172 in my BMW?

- Diagnosis typically involves using an OBDII scanner to read the fault code, checking the ambient pressure sensor for proper functioning, inspecting the vacuum lines for leaks, and verifying the air intake system's integrity.

4. What are the repair options for OBDII code P1172 in a BMW?

- Repair options may include replacing the ambient pressure sensor, repairing any vacuum leaks, cleaning or replacing the air filter, and ensuring proper sealing of the air intake system.

5. Can I drive my BMW with the OBDII code P1172 present?

- It is not recommended to drive your BMW with the OBDII code P1172 unresolved, as it can lead to further engine performance issues and potential damage if left unchecked.

6. How important is it to address the OBDII code P1172 in a BMW promptly?

- It is important to address the OBDII code P1172 promptly to prevent any potential long-term damage to the engine and ensure optimal performance and fuel efficiency of the vehicle.

7. What are some DIY tips for resolving the OBDII code P1172 in a BMW?

- DIY tips may include checking and cleaning the ambient pressure sensor, inspecting the vacuum lines for leaks, and ensuring proper installation of the air filter.

8. Is it necessary to reset the OBDII code P1172 after making repairs to the BMW?

- Yes, it is recommended to reset the OBDII code P1172 after making repairs to clear the fault code from the vehicle's system and ensure proper functioning.

9. Can extreme weather conditions affect the triggering of OBDII code P1172 in a BMW?

- Yes, extreme weather conditions such as very high or low ambient pressure levels can potentially trigger the OBDII code P1172 related to the Ambient Pressure Sensor Rationality Check.

10. How can regular maintenance help prevent the occurrence of OBDII code P1172 in a BMW?

- Regular maintenance, including checking the ambient pressure sensor during routine inspections, monitoring vacuum lines for leaks, and replacing air filters as needed, can help prevent issues leading to the OBDII code P1172 in a BMW.