BMW DTC P2238 – O2 Sensor Positive Current Control Circuit Low (Bank 1 Sensor 1)
DTC P2238 meaning on BMW
The Diagnostic Trouble Code (DTC) P2238 for BMW refers to the O2 Sensor Positive Current Control Circuit Low on Bank 1 Sensor 1. This code indicates that there is a problem with the oxygen sensor’s positive current control circuit, specifically on the first bank of the engine.
BMW DTC P2238 symptoms
Symptoms of DTC P2238 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Reduced engine performance
BMW DTC P2238 causes
Common causes of DTC P2238 on a BMW include:
- Faulty oxygen sensor
- Wiring or connector issues in the oxygen sensor circuit
- Exhaust leaks near the oxygen sensor
- Engine running rich or lean
BMW DTC P2238 seriousness
DTC P2238 should not be ignored as it can lead to poor engine performance and decreased fuel efficiency. While the vehicle may still be operable with this code present, it is recommended to address the issue promptly to prevent further damage to the engine or emissions system.
How to diagnose DTC P2238 on BMW
To diagnose DTC P2238 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault code and any related codes.
- Inspect the wiring and connectors in the oxygen sensor circuit for any damage or corrosion.
- Check for exhaust leaks near the oxygen sensor.
- Test the oxygen sensor using a multimeter to ensure it is functioning properly.
How to fix DTC P2238 on BMW
To fix DTC P2238 on a BMW, you can try the following:
- Replace the faulty oxygen sensor if it is determined to be the cause of the issue.
- Repair any damaged wiring or connectors in the oxygen sensor circuit.
- Address any exhaust leaks near the oxygen sensor.
- If the engine is running rich or lean, diagnose and fix the underlying issue.
How to erase DTC P2238 on BMW
To erase DTC P2238 on a BMW, you can use a diagnostic scanner to clear the fault code from the vehicle’s computer. After addressing the underlying issue that caused the code, you can reset the Check Engine Light and monitor the vehicle for any recurring issues.
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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