BMW DTC P0055 – HO2S Heater Resistance (Bank 1 Sensor 3)
DTC P0055 meaning on BMW
DTC P0055 for BMW refers to an issue with the Heated Oxygen Sensor (HO2S) Heater Resistance in Bank 1 Sensor 3. This diagnostic trouble code indicates that there is a problem with the electrical circuit that controls the heater element in the oxygen sensor.
BMW DTC P0055 symptoms
Symptoms of DTC P0055 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 P0055 causes
Common causes of DTC P0055 on a BMW include:
- Faulty oxygen sensor
- Wiring or connector issues in the oxygen sensor circuit
- Blown fuse related to the oxygen sensor heater
- PCM (Powertrain Control Module) failure
BMW DTC P0055 seriousness
While DTC P0055 may not cause immediate drivability issues, it can lead to decreased fuel efficiency and increased emissions. Ignoring this fault code can result in potential long-term damage to the vehicle’s engine and catalytic converter.
How to diagnose DTC P0055 on BMW
To diagnose DTC P0055 on a BMW, you can perform the following steps:
- Use an OBD-II scanner to retrieve the fault code and freeze frame data
- Inspect the wiring and connectors related to the Bank 1 Sensor 3 oxygen sensor
- Check the fuse related to the oxygen sensor heater
- Test the resistance of the oxygen sensor heater using a multimeter
How to fix DTC P0055 on BMW
To fix DTC P0055 on a BMW, you can try the following solutions:
- Replace the Bank 1 Sensor 3 oxygen sensor
- Repair any damaged wiring or connectors in the oxygen sensor circuit
- Replace the blown fuse related to the oxygen sensor heater
- If necessary, replace the PCM (Powertrain Control Module)
How to erase DTC P0055 on BMW
To erase DTC P0055 on a BMW, you can use an OBD-II scanner to clear the fault code from the vehicle’s memory. After fixing the underlying issue causing the fault code, clearing it will reset the Check Engine Light and ensure the code does not reappear.
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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