P2240 – BMW DTC

BMW DTC P2240 – O2 Sensor Positive Current Control Circuit/Open (Bank 2 Sensor 1)

DTC P2240 meaning on BMW

The Diagnostic Trouble Code (DTC) P2240 for BMW indicates an issue with the O2 Sensor Positive Current Control Circuit/Open on Bank 2 Sensor 1. This means that there is an open circuit or a lack of continuity in the wiring or connector related to the O2 sensor located in Bank 2 Sensor 1 position.

BMW DTC P2240 symptoms

Symptoms of DTC P2240 on a BMW may include:

• Check Engine Light (MIL) illuminated on the dashboard
• Decreased fuel efficiency
• Engine running rough or misfiring
• Reduced engine performance

BMW DTC P2240 causes

Common causes of DTC P2240 on a BMW include:

• Faulty O2 sensor in Bank 2 Sensor 1
• Open circuit or short in the wiring harness connected to the O2 sensor
• Corrosion or poor connection at the O2 sensor connector
• Issues with the Engine Control Module (ECM)

BMW DTC P2240 seriousness

While DTC P2240 may not cause immediate drivability issues, it is important to address this problem promptly to prevent potential damage to the engine and ensure optimal performance and fuel efficiency of the vehicle.

How to diagnose DTC P2240 on BMW

To diagnose DTC P2240 on a BMW, you can follow these steps:

1. Use an OBD-II scanner to retrieve the fault codes and confirm the presence of DTC P2240.
2. Inspect the wiring harness and connector related to Bank 2 Sensor 1 for any visible damage, corrosion, or loose connections.
3. Test the O2 sensor in Bank 2 Sensor 1 using a multimeter to check for proper resistance and continuity.
4. Check the ECM for any stored codes or issues that may be affecting the O2 sensor circuit.

How to fix DTC P2240 on BMW

To fix DTC P2240 on a BMW, you can try the following solutions:

1. Replace the O2 sensor in Bank 2 Sensor 1 with a new, OEM-quality sensor.
2. Repair any open circuits or shorts in the wiring harness connected to the O2 sensor.
3. Clean or replace the connector at the O2 sensor to ensure a secure and proper connection.
4. If necessary, diagnose and address any issues with the ECM that may be causing the fault code.

How to erase DTC P2240 on BMW

To erase DTC P2240 on a BMW, you can use an OBD-II scanner to clear the fault code after the underlying issue has been diagnosed and fixed. Once the repair has been completed, you can reset the Check Engine Light and erase the DTC P2240 code from the vehicle’s memory.

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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