BMW DTC P0044 – HO2S Heater Control Circuit High (Bank 1 Sensor 3)
DTC P0044 meaning on BMW
DTC P0044 on a BMW refers to the ¨HO2S Heater Control Circuit High (Bank 1 Sensor 3)¨ error code. This diagnostic trouble code indicates that there is a high voltage condition in the heater control circuit of the oxygen sensor located in Bank 1 Sensor 3.
BMW DTC P0044 symptoms
Symptoms of DTC P0044 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Possible sulfur or rotten egg smell from the exhaust
BMW DTC P0044 causes
Common causes of DTC P0044 on a BMW include:
- Faulty oxygen sensor heater
- Wiring or connector issues in the oxygen sensor heater circuit
- Blown fuse related to the oxygen sensor heater circuit
- ECU (Engine Control Unit) malfunction
BMW DTC P0044 seriousness
While DTC P0044 may not cause immediate drivability issues, it can lead to decreased fuel efficiency and potential long-term damage to the catalytic converter if left unresolved. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P0044 on BMW
To diagnose DTC P0044 on a BMW, you can perform the following steps:
- Use an OBD-II scanner to retrieve the specific error code and confirm it is P0044.
- Inspect the wiring and connectors in the oxygen sensor heater circuit for any visible damage or corrosion.
- Check the fuse related to the oxygen sensor heater for continuity.
- Test the oxygen sensor heater for proper resistance values.
- If necessary, perform a thorough inspection of the ECU for any signs of malfunction.
How to fix DTC P0044 on BMW
To fix DTC P0044 on a BMW, you can try the following solutions:
- Replace the faulty oxygen sensor heater with a new one.
- Repair or replace any damaged wiring or connectors in the oxygen sensor heater circuit.
- Replace the blown fuse related to the oxygen sensor heater.
- If the ECU is found to be faulty, consider repairing or replacing it.
How to erase DTC P0044 on BMW
To erase DTC P0044 on a BMW, you can use an OBD-II scanner to clear the error code from the ECU’s memory. After addressing the underlying issue causing the DTC, clearing the code will reset the Check Engine Light and ensure the system is functioning properly.
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.