P1158 – BMW DTC

BMW DTC P1158 – Fuel Trim Adaptation Additive Low (Bank 1)

DTC P1158 meaning on BMW

The DTC P1158 on a BMW indicates a fault with the fuel trim adaptation additive system on Bank 1. This fault code specifically points to a low level of fuel trim adaptation additive being detected by the engine control module (ECM).

BMW DTC P1158 symptoms

Symptoms of DTC P1158 on a BMW may include:

• Check Engine Light (MIL) illuminated
• Decreased fuel efficiency
• Engine running lean or rich
• Engine hesitation or misfires

BMW DTC P1158 causes

The common causes of DTC P1158 on a BMW include:

• Faulty fuel trim adaptation additive system
• Issues with the fuel pressure regulator
• Vacuum leaks in the intake system
• Malfunctioning oxygen sensor

BMW DTC P1158 seriousness

While DTC P1158 may not cause immediate drivability issues, it can lead to poor engine performance and reduced fuel efficiency if left unresolved. Ignoring this fault code may result in potential damage to the engine components over time.

How to diagnose DTC P1158 on BMW

To diagnose DTC P1158 on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the fuel trim adaptation additive system for any leaks or malfunctions
3. Check the fuel pressure regulator and oxygen sensor for proper operation
4. Perform a smoke test to identify any vacuum leaks in the intake system

How to fix DTC P1158 on BMW

To fix DTC P1158 on a BMW, the following steps may be taken:

1. Repair or replace any faulty components in the fuel trim adaptation additive system
2. Address any issues with the fuel pressure regulator or oxygen sensor
3. Fix any vacuum leaks in the intake system
4. Clear the fault code and reset the ECM

How to erase DTC P1158 on BMW

To erase DTC P1158 on a BMW, the fault code can be cleared using a diagnostic scanner. After the necessary repairs have been made to address the underlying issue, the ECM can be reset to clear the fault code and turn off the Check Engine Light.

Recommended tools & DTC Scanners for BMW

Best Diagnostic App for modern BMWs: BimmerLink

Recommended Bluetooth adapter for Bimmerlink: OBDLink CX

Cable adapter for Bimmerlink: Enet Cable USB Type C

For older BMWs we recommend: Autel AutoLink AL319 (2024 version)

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

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