BMW DTC P1189 – Fuel Control (Bank 2 Sensor 1)
DTC P1189 meaning on BMW
The DTC P1189 on a BMW indicates a fault with the fuel control system for Bank 2 Sensor 1. This fault code specifically points to an issue with the fuel mixture being too lean in the engine’s bank 2, which is typically the side of the engine that does not contain the number 1 cylinder.
BMW DTC P1189 symptoms
Symptoms associated with BMW DTC P1189 may include:
- Check Engine Light (MIL) illuminated on the dashboard
- Decreased fuel efficiency
- Engine misfires or hesitation
- Rough idling or stalling
BMW DTC P1189 causes
Common causes of BMW DTC P1189 include:
- Faulty oxygen sensor (Bank 2 Sensor 1)
- Vacuum leaks in the intake system
- Fuel delivery issues
- Dirty or clogged fuel injectors
- Issues with the Mass Airflow Sensor (MAF)
BMW DTC P1189 seriousness
Ignoring the DTC P1189 on a BMW can lead to potential engine damage and decreased performance. Running the engine with a lean fuel mixture can cause overheating, damage to the catalytic converter, and other serious issues over time.
How to diagnose DTC P1189 on BMW
To diagnose DTC P1189 on a BMW, you can perform the following steps:
- Use an OBD-II scanner to retrieve the fault code and freeze frame data
- Inspect the Bank 2 Sensor 1 oxygen sensor for proper operation
- Check for vacuum leaks in the intake system
- Test the fuel delivery system for proper pressure and flow
- Clean or replace clogged fuel injectors
How to fix DTC P1189 on BMW
To fix DTC P1189 on a BMW, you can try the following solutions:
- Replace the Bank 2 Sensor 1 oxygen sensor if faulty
- Repair any vacuum leaks in the intake system
- Clean or replace clogged fuel injectors
- Check and replace the Mass Airflow Sensor (MAF) if necessary
- Ensure proper fuel pressure and delivery
How to erase DTC P1189 on BMW
To erase DTC P1189 on a BMW, you can use an OBD-II scanner to clear the fault code from the vehicle’s computer. After fixing the underlying issue causing the fault code, clearing the code will reset the Check Engine Light and monitor the system for any new faults.
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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