AutoCodes – BMW – P1158 BMW

P1158 BMW Code - Fuel Trim Adaptation Additive Low Bank 1

Quick Answer

Short term fuel trim (STFT) is a value that indicates how the Engine Control Module (ECM) is adapting the factory programmed fuel map. Common causes include Air leaks, Faulty Mass Air Flow (MAF) Sensor, Faulty Oxygen Sensor Bank 1. 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: P1158 BMW indicates Fuel Trim Adaptation Additive Low Bank 1.
Common causes: Common causes include Air leaks, Faulty Mass Air Flow (MAF) Sensor, Faulty Oxygen Sensor Bank 1.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,073

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 Jul 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1158 BMW Description

Short term fuel trim (STFT) is a value that indicates how the Engine Control Module (ECM) is adapting the factory programmed fuel map. The fuel map is a lookup table that is referred to by the controller. This is used to govern the correct amount of fuel to inject. This amount depends on the speed and load conditions monitored on the vehicle. The (STFT) Value alters depending on which fuel map load cell the engine is operating during speed and load conditions.
The oxygen sensor is a key part of the fuel trim calculation. If the Oxygen sensor indicates a lean mixture, the (STFT) will be increased above the typical Value. If the Oxygen Sensor indicates a rich mixture the (STFT) will be reduced below the typical Value. In normal operation, the fuel trim values will cycle between a maximum of 10 and -10%. (STFT) which exceed this Value should be investigated.

OBDII Code P1158 BMW - Fuel Trim Adaptation Additive Low Bank 1 - AutoCodes.com — P1158 BMW Code - Fuel Trim Adaptation Additive Low Bank 1

What does this mean?

What are the Possible Causes of the DTC P1158 BMW?

Air leaks
Faulty Mass Air Flow (MAF) Sensor
Faulty Oxygen Sensor Bank 1
Low Fuel Pressure
Faulty Spark Plugs
Faulty Fuel Injectors

How to Fix the DTC P1158 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 P1158 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 P1158 BMW code?

Need more information on how to fix the P1158 BMW code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1158 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 P1158 BMW Code

1. What does OBDII code P1158 on a BMW mean?

The code P1158 indicates "Fuel Trim Adaptation Additive Low Bank 1" on a BMW vehicle.

2. What are the common symptoms of OBDII code P1158 on a BMW?

Common symptoms include rough idling, decreased fuel efficiency, engine hesitation, and potential stalling.

3. What can cause the OBDII code P1158 on a BMW?

Possible causes of P1158 include a vacuum leak, faulty oxygen sensor, fuel system issues, intake air leaks, or a malfunctioning mass airflow sensor.

4. How can I diagnose the OBDII code P1158 on my BMW?

Diagnosis involves checking for vacuum leaks, inspecting the oxygen sensor, testing the fuel system, scanning for intake air leaks, and examining the mass airflow sensor.

5. Can I continue driving my BMW with the P1158 code?

It is not recommended to drive your BMW with the P1158 code, as it can lead to poor engine performance and potentially cause further damage.

6. How do I repair the OBDII code P1158 on my BMW?

Repair options include fixing any vacuum leaks, replacing the oxygen sensor if necessary, addressing fuel system issues, sealing intake air leaks, or replacing a faulty mass airflow sensor.

7. Will resetting the OBDII code P1158 on my BMW make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear.

8. Can I fix the OBDII code P1158 on my BMW myself?

Depending on your mechanical skills and tools available, you may be able to address some causes of P1158 yourself, but complex issues may require professional assistance.

9. How much does it cost to repair the OBDII code P1158 on a BMW?

The cost of repair for P1158 can vary widely depending on the specific cause, parts needed, and labor rates at repair shops.

10. Is it safe to ignore the OBDII code P1158 on my BMW?

Ignoring the P1158 code can result in poor engine performance, reduced fuel efficiency, and potential long-term damage, so it is best to address the issue promptly.