BMW DTC P1159 – Fuel Trim Adaptation Additive High (Bank 1)
DTC P1159 meaning on BMW
The DTC P1159 on a BMW indicates that the fuel trim adaptation additive is high on Bank 1. This means that the engine control module (ECM) has detected that the fuel mixture is too rich and is compensating by adding more fuel than necessary.
BMW DTC P1159 symptoms
Symptoms of DTC P1159 on a BMW may include:
- Check Engine Light (CEL) illuminated
- Decreased fuel efficiency
- Rough idling or stalling
- Engine hesitation or misfiring
BMW DTC P1159 causes
The common causes of DTC P1159 on a BMW include:
- Vacuum leaks
- Faulty oxygen sensor
- Dirty or clogged fuel injectors
- Issues with the mass airflow sensor
- Fuel pressure regulator problems
BMW DTC P1159 seriousness
Ignoring DTC P1159 on a BMW can lead to decreased fuel efficiency, potential engine damage, and increased emissions. It is important to address this issue promptly to prevent further complications.
How to diagnose DTC P1159 on BMW
To diagnose DTC P1159 on a BMW, you can perform the following steps:
- Use an OBD-II scanner to retrieve the fault code and freeze frame data
- Inspect for any visible signs of vacuum leaks
- Check the oxygen sensor readings and functionality
- Clean or replace fuel injectors if necessary
- Test the mass airflow sensor and fuel pressure regulator
How to fix DTC P1159 on BMW
To fix DTC P1159 on a BMW, you can try the following solutions:
- Repair any vacuum leaks and replace damaged hoses
- Replace the faulty oxygen sensor
- Clean or replace clogged fuel injectors
- Clean or replace the mass airflow sensor
- Check and adjust the fuel pressure regulator
How to erase DTC P1159 on BMW
To erase DTC P1159 on a BMW, you can use an OBD-II scanner to clear the fault code after addressing the underlying issue. Once the repair has been completed, you can reset the ECM 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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