BMW DTC P112C – O2 Sensor Negative Current or Positive Current Control Circuit/Open (Bank 1 Sensor 1)
DTC P112C meaning on BMW
DTC P112C on a BMW indicates an issue with the O2 sensor negative current or positive current control circuit for Bank 1 Sensor 1. This fault code is related to the oxygen sensor located before the catalytic converter on the bank 1 side of the engine.
BMW DTC P112C symptoms
Symptoms of DTC P112C on a BMW may include poor engine performance, decreased fuel efficiency, rough idling, hesitation during acceleration, and an illuminated check engine light on the dashboard.
BMW DTC P112C causes
The common causes of DTC P112C on a BMW include a faulty O2 sensor, damaged wiring or connectors in the sensor circuit, a blown fuse, or issues with the engine control module (ECM).
BMW DTC P112C seriousness
While DTC P112C may not cause immediate harm to the vehicle, it can lead to decreased engine efficiency and increased emissions. Ignoring this fault code can result in potential long-term damage to the engine and catalytic converter.
How to diagnose DTC P112C on BMW
To diagnose DTC P112C on a BMW, start by using an OBD-II scanner to retrieve the fault code. Then, visually inspect the wiring and connectors related to the Bank 1 Sensor 1 O2 sensor. Check for any signs of damage or corrosion. Test the O2 sensor using a multimeter to ensure it is functioning correctly. If needed, perform a continuity test on the sensor circuit to identify any open circuits.
How to fix DTC P112C on BMW
To fix DTC P112C on a BMW, start by replacing the Bank 1 Sensor 1 O2 sensor if it is found to be faulty. Ensure all wiring and connectors are in good condition and make any necessary repairs. If the issue persists, check the fuse related to the O2 sensor circuit and replace if necessary. If the problem still exists, further diagnosis of the ECM may be required.
How to erase DTC P112C on BMW
After fixing the underlying issue causing DTC P112C on a BMW, you can erase the fault code using an OBD-II scanner. Simply clear the code from the ECM’s memory, and if the repair was successful, the check engine light should turn off. Ensure that the repair has resolved the problem before clearing 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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