BMW DTC P0057 – HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
DTC P0057 meaning on BMW
DTC P0057 refers to the Oxygen (O2) Sensor Heater Control Circuit Low for Bank 2 Sensor 2 in a BMW. This diagnostic trouble code indicates that the engine control module (ECM) has detected a low voltage condition in the heater control circuit of the downstream oxygen sensor located after the catalytic converter on bank 2 of the engine.
BMW DTC P0057 symptoms
Symptoms of a DTC P0057 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Failed emissions test
BMW DTC P0057 causes
Common causes of a DTC P0057 on a BMW include:
- Faulty oxygen sensor heater
- Open or short in the heater circuit wiring
- Faulty engine control module (ECM)
- Corrosion or poor connections in the sensor or wiring
BMW DTC P0057 seriousness
While a DTC P0057 may not cause immediate drivability issues, it can lead to decreased fuel efficiency and increased emissions. Ignoring this code can potentially cause damage to the catalytic converter over time.
How to diagnose DTC P0057 on BMW
To diagnose a DTC P0057 on a BMW, you can:
- Use an OBD-II scanner to retrieve the specific fault code
- Inspect the wiring and connectors for any visible damage or corrosion
- Test the oxygen sensor heater circuit for continuity and resistance
- Check the ECM for any stored codes related to the oxygen sensor
How to fix DTC P0057 on BMW
To fix a DTC P0057 on a BMW, you may need to:
- Replace the faulty oxygen sensor with a new one
- Repair any damaged wiring or connectors in the heater circuit
- Clean or replace corroded connectors
- Reset the ECM after making repairs
How to erase DTC P0057 on BMW
To erase a DTC P0057 on a BMW, you can:
- Use an OBD-II scanner to clear the fault code
- Alternatively, disconnect the battery for a few minutes to reset the ECM
- Ensure that the underlying issue causing the fault code has been resolved before clearing it
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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