BMW DTC P0037 – HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
DTC P0037 meaning on BMW
DTC P0037 refers to the Heater Control Circuit Low for the Heated Oxygen Sensor (HO2S) located in Bank 1 Sensor 2 in a BMW vehicle. This diagnostic trouble code indicates that the powertrain control module (PCM) has detected a low voltage condition in the heater control circuit of the downstream oxygen sensor.
BMW DTC P0037 symptoms
Symptoms of DTC P0037 in a BMW may include:
- Check Engine Light illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Failed emissions test
BMW DTC P0037 causes
Common causes of DTC P0037 in a BMW include:
- Faulty oxygen sensor
- Open or short in the heater circuit wiring
- Faulty PCM
- Corrosion or poor connections in the sensor circuit
BMW DTC P0037 seriousness
While DTC P0037 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 P0037 on BMW
To diagnose DTC P0037 on a BMW, you can perform the following steps:
- 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 PCM for any stored codes related to the sensor.
How to fix DTC P0037 on BMW
To fix DTC P0037 on a BMW, you can try the following solutions:
- Replace the downstream oxygen sensor in Bank 1 Sensor 2.
- Repair any damaged wiring or connectors in the heater circuit.
- Clear the fault code and monitor the system for any reoccurrence.
How to erase DTC P0037 on BMW
To erase DTC P0037 on a BMW, you can use an OBD-II scanner to clear the fault code from the PCM’s memory. After clearing the code, it is recommended to drive the vehicle and monitor for any return of the fault 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
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