BMW DTC P22B4 – O2 Sensor Negative Current Control Circuit High (Bank 1 Sensor 2)
DTC P22B4 meaning on BMW
The DTC P22B4 code on a BMW indicates an issue with the O2 Sensor Negative Current Control Circuit High for Bank 1 Sensor 2. This means that the control module has detected a high voltage condition in the circuit responsible for controlling the negative current of the downstream oxygen sensor on bank 1.
BMW DTC P22B4 symptoms
Symptoms of the BMW DTC P22B4 code may include:
- Check Engine Light illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Increased emissions
BMW DTC P22B4 causes
Common causes of the BMW DTC P22B4 code include:
- Faulty oxygen sensor
- Wiring or connector issues in the O2 sensor circuit
- Exhaust leaks near the sensor
- Issues with the engine control module
BMW DTC P22B4 seriousness
The DTC P22B4 code should not be ignored as it can lead to poor engine performance, decreased fuel efficiency, and increased emissions. Ignoring this issue may also cause damage to other components of the vehicle over time.
How to diagnose DTC P22B4 on BMW
To diagnose the DTC P22B4 code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring and connectors in the O2 sensor circuit
- Check for exhaust leaks near the sensor
- Test the oxygen sensor for proper operation
How to fix DTC P22B4 on BMW
To fix the DTC P22B4 code on a BMW, the following steps may be taken:
- Replace the faulty oxygen sensor
- Repair any damaged wiring or connectors in the circuit
- Address any exhaust leaks near the sensor
- If necessary, reprogram or replace the engine control module
How to erase DTC P22B4 on BMW
To erase the DTC P22B4 code on a BMW, the fault must first be fixed. Once the underlying issue has been addressed, a diagnostic scanner can be used to clear the code and reset the Check Engine Light.
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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