BMW DTC P2243 – O2 Sensor Reference Voltage Circuit/Open (Bank 1 Sensor 1)
DTC P2243 meaning on BMW
The Diagnostic Trouble Code (DTC) P2243 for BMW indicates an issue with the O2 Sensor Reference Voltage Circuit/Open on Bank 1 Sensor 1. This means that there is a problem with the electrical circuit or an open circuit in the oxygen sensor’s reference voltage circuit.
BMW DTC P2243 symptoms
Symptoms of DTC P2243 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Poor fuel economy
- Engine running rough or misfiring
- Reduced engine performance
BMW DTC P2243 causes
Common causes of DTC P2243 on a BMW include:
- Faulty O2 sensor
- Open or short circuit in the wiring harness
- Corrosion or poor connections in the sensor circuit
- Issues with the engine control module (ECM)
BMW DTC P2243 seriousness
While DTC P2243 may not cause immediate drivability issues, it can lead to poor engine performance and reduced fuel efficiency if left unresolved. Ignoring this fault can also potentially cause damage to other engine components over time.
How to diagnose DTC P2243 on BMW
To diagnose DTC P2243 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the wiring harness for any visible damage or corrosion
- Check the O2 sensor for proper operation and connection
- Test the reference voltage circuit for continuity and proper voltage levels
- Inspect the ECM for any signs of malfunction
How to fix DTC P2243 on BMW
To fix DTC P2243 on a BMW, you can try the following solutions:
- Replace the faulty O2 sensor
- Repair any damaged wiring or connectors in the circuit
- Clean or replace corroded connectors
- Reset the ECM and clear the fault code
- Perform a road test to ensure the issue has been resolved
How to erase DTC P2243 on BMW
To erase DTC P2243 on a BMW, you can use a diagnostic scanner to clear the fault code from the ECM’s memory. After fixing the underlying issue causing the fault code, clearing the code will reset the Check Engine Light and ensure that the fault has been addressed.
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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