BMW DTC P122A – Barometric Pressure Sensor ‘B’ Afterrunning Diagnosis Pressure Too Low
DTC P122A meaning on BMW
The DTC P122A on a BMW indicates that the Barometric Pressure Sensor ‘B’ has detected that the afterrunning diagnosis pressure is too low. This sensor is responsible for measuring the atmospheric pressure outside the vehicle, which is crucial for the engine’s performance and emissions control.
BMW DTC P122A symptoms
Some common symptoms of the DTC P122A on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Poor fuel efficiency
- Rough idling or stalling
BMW DTC P122A causes
There are several potential causes for the DTC P122A on a BMW, including:
- Malfunctioning Barometric Pressure Sensor ‘B’
- Vacuum leaks in the intake system
- Faulty wiring or connections to the sensor
- Issues with the engine’s air intake system
BMW DTC P122A seriousness
While the DTC P122A may not cause immediate harm to the vehicle, it can lead to reduced engine performance and increased emissions. Ignoring this issue can potentially cause further damage to the engine over time.
How to diagnose DTC P122A on BMW
Diagnosing the DTC P122A on a BMW typically involves the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the Barometric Pressure Sensor ‘B’ for any visible damage or signs of malfunction
- Check for vacuum leaks in the intake system
- Test the sensor’s wiring and connections for continuity and proper voltage
How to fix DTC P122A on BMW
To fix the DTC P122A on a BMW, you may need to:
- Replace the Barometric Pressure Sensor ‘B’ if it is found to be faulty
- Repair any vacuum leaks in the intake system
- Ensure all wiring and connections to the sensor are secure and functioning properly
- Clear the fault codes and reset the Check Engine Light
How to erase DTC P122A on BMW
To erase the DTC P122A on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer. Once the codes are cleared, the Check Engine Light should turn off. It is important to address and fix the underlying issue causing the fault code before clearing it to prevent it from reoccurring.
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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