BMW DTC P0056 – HO2S Heater Control Circuit (Bank 2 Sensor 2)
DTC P0056 meaning on BMW
DTC P0056 for BMW refers to a fault in the HO2S (Heated Oxygen Sensor) Heater Control Circuit for Bank 2 Sensor 2. This code indicates that there is an issue with the electrical circuit that controls the heater element in the oxygen sensor located downstream of the catalytic converter on bank 2 of the engine.
BMW DTC P0056 symptoms
Symptoms of DTC P0056 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Failed emissions test
BMW DTC P0056 causes
Common causes of DTC P0056 on a BMW include:
- Faulty oxygen sensor heater
- Wiring or connector issues in the oxygen sensor circuit
- Blown fuse related to the oxygen sensor heater circuit
- PCM (Powertrain Control Module) failure
BMW DTC P0056 seriousness
While DTC P0056 may not cause immediate drivability issues, it can lead to decreased fuel efficiency and increased emissions. Ignoring this fault can potentially cause damage to the catalytic converter over time.
How to diagnose DTC P0056 on BMW
To diagnose DTC P0056 on a BMW, you can follow these steps:
- Use an OBD-II scanner to retrieve the fault code and freeze frame data
- Inspect the wiring and connectors related to Bank 2 Sensor 2 oxygen sensor
- Check the fuse for the oxygen sensor heater circuit
- Test the resistance of the oxygen sensor heater
- Verify proper operation of the PCM
How to fix DTC P0056 on BMW
To fix DTC P0056 on a BMW, you can try the following solutions:
- Replace the Bank 2 Sensor 2 oxygen sensor
- Repair any damaged wiring or connectors in the oxygen sensor circuit
- Replace the fuse if it is blown
- If necessary, replace the PCM
How to erase DTC P0056 on BMW
To erase DTC P0056 on a BMW, you can use an OBD-II scanner to clear the fault code after the underlying issue has been resolved. This will reset the Check Engine Light and turn off the code.
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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.