BMW DTC P11D4 – Cylinder 3 Air-Fuel Ratio Imbalance, System Too Lean
DTC P11D4 meaning on BMW
The DTC P11D4 code on a BMW indicates a Cylinder 3 Air-Fuel Ratio Imbalance, System Too Lean. This means that the air-fuel mixture in cylinder 3 is leaner than the ideal ratio, causing an imbalance in the combustion process.
BMW DTC P11D4 symptoms
Symptoms of the BMW DTC P11D4 code may include rough idling, misfiring, loss of power, hesitation during acceleration, and potentially an illuminated check engine light on the dashboard.
BMW DTC P11D4 causes
The causes of the BMW DTC P11D4 code can vary, but common reasons include a vacuum leak, faulty oxygen sensor, clogged fuel injector, intake air leak, or a problem with the fuel delivery system.
BMW DTC P11D4 seriousness
Ignoring the DTC P11D4 code on a BMW can lead to decreased fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time. It is important to address this issue promptly to prevent further complications.
How to diagnose DTC P11D4 on BMW
To diagnose the DTC P11D4 code on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the specific fault codes. They would then perform a visual inspection of the engine components, check for vacuum leaks, test the oxygen sensor, inspect the fuel injectors, and ensure proper fuel delivery.
How to fix DTC P11D4 on BMW
Fixing the BMW DTC P11D4 code may involve repairing or replacing the faulty components identified during the diagnostic process. This could include fixing vacuum leaks, replacing the oxygen sensor, cleaning or replacing the fuel injector, repairing intake air leaks, or addressing issues with the fuel delivery system.
How to erase DTC P11D4 on BMW
Once the underlying issue causing the DTC P11D4 code on a BMW has been resolved, the code can be cleared using a diagnostic scanner. This will reset the check engine light and erase the fault code from the vehicle’s memory.
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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.