P2249 – BMW DTC

BMW DTC P2249 – O2 Sensor Reference Voltage Circuit Low (Bank 2 Sensor 1)

DTC P2249 meaning on BMW

The Diagnostic Trouble Code (DTC) P2249 for BMW indicates an issue with the O2 Sensor Reference Voltage Circuit being low for Bank 2 Sensor 1. This means that the voltage signal being sent by the O2 sensor located in Bank 2, Sensor 1 is lower than the expected reference voltage.

BMW DTC P2249 symptoms

Symptoms of DTC P2249 on a BMW may include:

• Check Engine Light (MIL) illuminated on the dashboard
• Poor engine performance
• Decreased fuel efficiency
• Irregular idling

BMW DTC P2249 causes

Common causes of DTC P2249 on a BMW include:

• Faulty O2 sensor in Bank 2 Sensor 1
• Wiring or connector issues in the O2 sensor circuit
• ECU (Engine Control Unit) malfunction

BMW DTC P2249 seriousness

While DTC P2249 may not cause immediate harm to the vehicle, it can lead to poor engine performance and decreased fuel efficiency if left unresolved. It is recommended to address this issue promptly to prevent further complications.

How to diagnose DTC P2249 on BMW

To diagnose DTC P2249 on a BMW, you can follow these steps:

1. Use an OBD-II scanner to retrieve the fault codes
2. Inspect the wiring and connectors related to Bank 2 Sensor 1
3. Check the voltage output of the O2 sensor using a multimeter
4. Perform a visual inspection of the O2 sensor for any physical damage

How to fix DTC P2249 on BMW

To fix DTC P2249 on a BMW, you can try the following solutions:

1. Replace the O2 sensor in Bank 2 Sensor 1
2. Repair any damaged wiring or connectors in the O2 sensor circuit
3. Reset the ECU and clear the fault codes

How to erase DTC P2249 on BMW

To erase DTC P2249 on a BMW, you can:

1. Use an OBD-II scanner to clear the fault codes
2. Disconnect the car battery for a few minutes to reset the ECU
3. Drive the vehicle for a short distance to allow the ECU to relearn the sensor values

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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