BMW DTC P22C4 – O2 Sensor Pumping Current Trim Circuit High (Bank 2 Sensor 2)
DTC P22C4 meaning on BMW
DTC P22C4 on a BMW indicates an issue with the O2 Sensor Pumping Current Trim Circuit being too high for Bank 2 Sensor 2. This fault code is specific to the oxygen sensor located after the catalytic converter on the second bank of cylinders in the BMW’s engine.
BMW DTC P22C4 symptoms
Symptoms of DTC P22C4 on a BMW may include poor engine performance, decreased fuel efficiency, rough idling, and potentially an illuminated Check Engine Light on the dashboard.
BMW DTC P22C4 causes
The high O2 Sensor Pumping Current Trim Circuit in Bank 2 Sensor 2 can be caused by issues such as a faulty oxygen sensor, wiring problems, exhaust leaks, or issues with the engine control module.
BMW DTC P22C4 seriousness
While the vehicle may still be operable with this fault, it is important to address DTC P22C4 promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance and fuel efficiency.
How to diagnose DTC P22C4 on BMW
To diagnose DTC P22C4 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and then perform further testing on the oxygen sensor, wiring, and related components to pinpoint the exact cause of the issue.
- Use a diagnostic scanner to read the fault code.
- Inspect the wiring and connectors for any signs of damage or corrosion.
- Test the oxygen sensor using a multimeter to check for proper voltage readings.
- Check for exhaust leaks that could be affecting sensor readings.
How to fix DTC P22C4 on BMW
Fixing DTC P22C4 on a BMW typically involves addressing the root cause of the high O2 Sensor Pumping Current Trim Circuit. This may include replacing the oxygen sensor, repairing wiring issues, fixing exhaust leaks, or reprogramming the engine control module.
- Replace the Bank 2 Sensor 2 oxygen sensor.
- Repair any damaged wiring or connectors.
- Fix any exhaust leaks in the system.
- If necessary, reprogram the engine control module to reset the fault code.
How to erase DTC P22C4 on BMW
Once the underlying issue causing DTC P22C4 on a BMW has been resolved, the fault code can be cleared using a diagnostic scanner to erase the code from the vehicle’s memory.
- Use a diagnostic scanner to clear the fault code.
- Perform a test drive to ensure the issue does not reoccur.
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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