BMW DTC P1119 – O2 Sensor Signal Circuit Slow Switching from Lean to Rich (Bank 1 Sensor 1)
DTC P1119 meaning on BMW
DTC P1119 on a BMW indicates an issue with the O2 sensor signal circuit slow switching from lean to rich for Bank 1 Sensor 1. This means that the oxygen sensor located before the catalytic converter on the bank 1 side of the engine is not switching between lean (high oxygen content) and rich (low oxygen content) conditions as quickly as expected.
BMW DTC P1119 symptoms
Symptoms of DTC P1119 on a BMW may include poor fuel economy, rough idling, hesitation or stumbling during acceleration, and potentially an illuminated Check Engine Light on the dashboard.
BMW DTC P1119 causes
The causes of DTC P1119 on a BMW can include a faulty O2 sensor, wiring issues in the O2 sensor circuit, a vacuum leak, exhaust leaks, or issues with the engine’s air-fuel mixture.
BMW DTC P1119 seriousness
While DTC P1119 may not cause immediate drivability issues, it can lead to decreased fuel efficiency and increased emissions. Ignoring this fault code can potentially cause damage to the catalytic converter over time.
How to diagnose DTC P1119 on BMW
To diagnose DTC P1119 on a BMW, a mechanic would typically start by using a scan tool to retrieve the specific fault code and then perform a visual inspection of the O2 sensor and its wiring. They may also conduct tests to check the sensor’s response to changes in the air-fuel mixture.
How to fix DTC P1119 on BMW
Fixing DTC P1119 on a BMW may involve replacing the O2 sensor, repairing any damaged wiring, fixing vacuum or exhaust leaks, or addressing issues with the engine’s fuel system. It is recommended to follow the manufacturer’s diagnostic and repair procedures to ensure a proper fix.
How to erase DTC P1119 on BMW
Once the underlying issue causing DTC P1119 on a BMW has been resolved, the fault code can be cleared using a scan tool capable of resetting codes. This will turn off the Check Engine Light and allow the vehicle’s onboard computer to 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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