AutoCodes – MINI – P1158 MINI

P1158 MINI 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 MINI 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.

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Code Popularity 691

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

What does this mean?

What are the Possible Causes of the DTC P1158 MINI?

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 MINI?

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 MINI 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 MINI code?

Need more information on how to fix the P1158 MINI 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 P1158 MINI Code

1. What are the common symptoms of OBDII code P1158 in a MINI related to Fuel Trim Adaptation Additive Low Bank 1?

- Common symptoms include rough idling, decreased fuel efficiency, and possible misfires.

2. What are the potential causes of OBDII code P1158 in a MINI?

- The code P1158 in a MINI can be caused by a vacuum leak, faulty oxygen sensor, or issues with the fuel injectors.

3. How can I diagnose the OBDII code P1158 related to Fuel Trim Adaptation Additive Low Bank 1 in a MINI?

- Diagnosis can involve checking for vacuum leaks, inspecting the oxygen sensor, and testing the fuel injectors for proper function.

4. Can driving with OBDII code P1158 in a MINI cause further damage?

- Continuing to drive with code P1158 may lead to decreased engine performance and potential damage to the catalytic converter.

5. What are some repair tips for addressing OBDII code P1158 in a MINI?

- Repair tips may include replacing the oxygen sensor, fixing any vacuum leaks, cleaning or replacing fuel injectors, and resetting the engine control module.

6. How can I prevent OBDII code P1158 related to Fuel Trim Adaptation Additive Low Bank 1 in my MINI?

- Regular maintenance, such as timely replacement of oxygen sensors and keeping the engine properly tuned, can help prevent code P1158 from occurring.

7. Can a DIY enthusiast fix OBDII code P1158 in a MINI?

- Depending on the root cause, some DIY enthusiasts may be able to address code P1158 by following repair guides and using basic tools.

8. Is it safe to continue driving my MINI with OBDII code P1158 present?

- It is not recommended to drive with code P1158 present, as it can lead to further engine issues and potentially affect the vehicle's performance.

9. How much does it typically cost to repair OBDII code P1158 in a MINI at a mechanic or dealership?

- The cost of repairing code P1158 can vary depending on the specific issue, but it may range from a few hundred to over a thousand dollars at a mechanic or dealership.

10. Will resetting the OBDII code P1158 in a MINI 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.