P248A – BMW DTC

BMW DTC P248A – Reductant Heater ‘A’ Sense Circuit Low

DTC P248A meaning on BMW

The Diagnostic Trouble Code (DTC) P248A for BMW refers to the Reductant Heater ‘A’ Sense Circuit Low. This code indicates that there is a problem with the electrical circuit associated with the Reductant Heater ‘A’ sensor, which is part of the vehicle’s emissions control system.

BMW DTC P248A symptoms

Symptoms of the DTC P248A on a BMW may include:

• Check Engine Light illuminated on the dashboard
• Reduced engine performance
• Potential increase in emissions

BMW DTC P248A causes

Common causes of the DTC P248A on a BMW include:

• Faulty Reductant Heater ‘A’ sensor
• Wiring or connector issues in the sensor circuit
• Defective powertrain control module (PCM)

BMW DTC P248A seriousness

The DTC P248A is considered a moderate severity fault. While it may not cause immediate drivability issues, it can lead to increased emissions and potential long-term engine performance problems if left unresolved.

How to diagnose DTC P248A on BMW

To diagnose the DTC P248A on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the Reductant Heater ‘A’ sensor and its wiring for any visible damage
3. Check the sensor’s resistance and compare it to specifications
4. Test the sensor circuit for continuity and proper voltage

How to fix DTC P248A on BMW

To fix the DTC P248A on a BMW, you may need to:

1. Replace the Reductant Heater ‘A’ sensor if it is faulty
2. Repair any damaged wiring or connectors in the sensor circuit
3. Reset the fault code and clear the Check Engine Light

How to erase DTC P248A on BMW

To erase the DTC P248A on a BMW, you can:

1. Use a diagnostic scanner to clear the fault code
2. Ensure that the underlying issue causing the fault code has been resolved
3. Perform a test drive to confirm that the Check Engine Light does not reappear

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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