BMW DTC P1255 – Manifold Absolute Pressure Too Low
DTC P1255 meaning on BMW
DTC P1255 on a BMW indicates that the Manifold Absolute Pressure (MAP) sensor is detecting a pressure reading that is lower than the expected range. The MAP sensor measures the pressure inside the intake manifold and helps the engine control unit (ECU) determine the correct air-fuel mixture for optimal engine performance.
BMW DTC P1255 symptoms
Symptoms of DTC P1255 on a BMW may include:
- Reduced engine power
- Poor acceleration
- Engine stalling
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P1255 causes
The common causes of DTC P1255 on a BMW include:
- Faulty MAP sensor
- Vacuum leaks in the intake system
- Issues with the intake manifold
- Wiring or connector problems in the MAP sensor circuit
BMW DTC P1255 seriousness
DTC P1255 should not be ignored as it can lead to poor engine performance and potential drivability issues. It is recommended to address this fault promptly to prevent further damage to the engine components.
How to diagnose DTC P1255 on BMW
To diagnose DTC P1255 on a BMW, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and check for any related codes.
- Inspect the MAP sensor and its wiring for any visible damage or corrosion.
- Check for vacuum leaks in the intake system using a smoke machine or a propane torch.
- Test the MAP sensor’s output voltage using a multimeter to ensure it is within the specified range.
How to fix DTC P1255 on BMW
To fix DTC P1255 on a BMW, you can try the following solutions:
- Replace the faulty MAP sensor with a new one.
- Repair any vacuum leaks in the intake system and ensure all connections are secure.
- Clean the intake manifold if there are any carbon deposits or debris present.
- Inspect and repair any damaged wiring or connectors in the MAP sensor circuit.
How to erase DTC P1255 on BMW
To erase DTC P1255 on a BMW, you can use a diagnostic scanner to clear the fault code from the ECU’s memory. After fixing the underlying issue causing the fault code, you can reset the code to turn off the Check Engine Light and ensure the repair was successful.
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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