BMW DTC P1140 – Mass or Volume Air Flow Circuit Range/Performance Problem
DTC P1140 meaning on BMW
The DTC P1140 for BMW indicates a Mass or Volume Air Flow Circuit Range/Performance Problem. This fault code is triggered when the Engine Control Module (ECM) detects that the signal from the mass airflow sensor is outside the expected range or not performing within the specified parameters.
BMW DTC P1140 symptoms
Symptoms of a DTC P1140 on a BMW may include:
- Check Engine Light (MIL) illuminated
- Reduced engine power
- Poor acceleration
- Engine stalling or rough idling
- Decreased fuel efficiency
BMW DTC P1140 causes
The common causes of a DTC P1140 on a BMW include:
- Dirty or faulty mass airflow sensor
- Vacuum leaks in the intake system
- Faulty wiring or connectors in the mass airflow sensor circuit
- Issues with the air intake system
BMW DTC P1140 seriousness
While a DTC P1140 may not cause immediate harm to the vehicle, it can lead to poor engine performance and reduced fuel efficiency. Ignoring this fault code can potentially cause further damage to the engine over time.
How to diagnose DTC P1140 on BMW
To diagnose a DTC P1140 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the mass airflow sensor for dirt or damage
- Check for vacuum leaks in the intake system
- Inspect the wiring and connectors in the mass airflow sensor circuit
- Perform a visual inspection of the air intake system
How to fix DTC P1140 on BMW
To fix a DTC P1140 on a BMW, the following steps may be taken:
- Clean or replace the mass airflow sensor
- Repair any vacuum leaks in the intake system
- Repair or replace faulty wiring or connectors in the mass airflow sensor circuit
- Ensure the air intake system is properly sealed and functioning
How to erase DTC P1140 on BMW
After addressing the underlying issue causing the DTC P1140 on a BMW, the fault code can be cleared using a diagnostic scanner. This will reset the Check Engine Light and allow the vehicle’s ECM 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
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.