AutoCodes – BMW – P158F BMW

P158F BMW Code - Cold Start Idle Air Control System Bank 2 RPM Lower Than Expected

Quick Answer

The Engine Control Module (ECM) monitors the Cold Start Idle Air Control System. Common causes include Faulty Cold Start Idle Air Control System, Cold Start Idle Air Control System harness is open or shorted, Cold Start Idle Air Control System 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: P158F BMW indicates Cold Start Idle Air Control System Bank 2 RPM Lower Than Expected.
Common causes: Common causes include Faulty Cold Start Idle Air Control System, Cold Start Idle Air Control System harness is open or shorted, Cold Start Idle Air Control System 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 1,335

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P158F BMW Description

The Engine Control Module (ECM) monitors the Cold Start Idle Air Control System. The ECM sets the OBDII code when the Cold Start Idle Air Control System is not to factory specifications.

OBDII Code P158F BMW - Cold Start Idle Air Control System Bank 2 RPM Lower Than Expected - AutoCodes.com — P158F BMW Code - Cold Start Idle Air Control System Bank 2 RPM Lower Than Expected

What does this mean?

What are the Possible Causes of the DTC P158F BMW?

Faulty Cold Start Idle Air Control System
Cold Start Idle Air Control System harness is open or shorted
Cold Start Idle Air Control System circuit poor electrical connection

How to Fix the DTC P158F 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 P158F 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 P158F BMW code?

Need more information on how to fix the P158F BMW code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P158F BMW code diagnosed by a professional: Find a repair shop in your area

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 P158F BMW Code

1. What are common symptoms of OBDII code P158F in a BMW related to the Cold Start Idle Air Control System Bank 2 RPM being lower than expected?

- Common symptoms include rough idle when starting the vehicle, stalling at idle, and an illuminated check engine light.

2. What are possible causes of OBDII code P158F in a BMW?

- Possible causes may include a faulty idle air control valve, vacuum leaks, issues with the fuel system, or a problem with the engine control module.

3. How can I diagnose the cause of OBDII code P158F in my BMW?

- To diagnose the issue, you can perform a visual inspection for any obvious signs of damage, check for vacuum leaks, test the idle air control valve, and use a diagnostic scan tool to gather more information.

4. Can driving with OBDII code P158F in a BMW cause further damage?

- Driving with this code may lead to reduced fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.

5. How can I repair OBDII code P158F in my BMW?

- Repair options include replacing the idle air control valve, fixing any vacuum leaks, addressing fuel system problems, or reprogramming the engine control module.

6. Is it safe to continue driving my BMW with OBDII code P158F?

- It is not recommended to drive with this code present, as it can impact the vehicle's performance and potentially lead to further issues if left unresolved.

7. How much does it typically cost to repair OBDII code P158F in a BMW?

- The cost of repairs can vary depending on the specific cause of the code, but it may range from a few hundred to a few thousand dollars, including parts and labor.

8. Can I reset the check engine light after repairing OBDII code P158F in my BMW?

- Yes, after the issue has been repaired, you can reset the check engine light using an OBDII scanner to clear the error code.

9. Are there any preventive measures to avoid OBDII code P158F in a BMW?

- Regular maintenance, such as cleaning or replacing the idle air control valve, checking for vacuum leaks, and ensuring the fuel system is in good condition, can help prevent this code from recurring.

10. Is OBDII code P158F specific to BMW vehicles, or can it occur in other car makes as well?

- While this specific code is related to BMW vehicles, similar issues with the idle air control system can occur in other car makes, leading to different OBDII codes.