BMW DTC P1155 – O2 Sensor Heater Circuit Signal Intermittent (Bank 2 Sensor 2)
DTC P1155 meaning on BMW
DTC P1155 indicates an O2 Sensor Heater Circuit Signal Intermittent issue on Bank 2 Sensor 2 in a BMW vehicle. This fault code specifically points to a problem with the oxygen sensor’s heating element circuit, which is responsible for ensuring the sensor operates at the optimal temperature for accurate readings.
BMW DTC P1155 symptoms
Symptoms of DTC P1155 in a BMW may include poor fuel economy, rough idling, engine misfires, a decrease in overall engine performance, and the illumination of the Check Engine Light on the dashboard.
BMW DTC P1155 causes
The common causes of DTC P1155 on a BMW are a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, a blown fuse related to the sensor heater circuit, or issues with the engine control module (ECM).
BMW DTC P1155 seriousness
While DTC P1155 may not cause immediate drivability issues, it can lead to decreased fuel efficiency and potential long-term damage to the engine if left unresolved. It is recommended to address this fault code promptly to prevent further complications.
How to diagnose DTC P1155 on BMW
To diagnose DTC P1155 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault code and then inspect the Bank 2 Sensor 2 oxygen sensor and its associated wiring for any visible damage or corrosion. Testing the sensor’s heating element and checking the related fuses and connectors would also be part of the diagnostic process.
How to fix DTC P1155 on BMW
Fixing DTC P1155 on a BMW usually involves replacing the Bank 2 Sensor 2 oxygen sensor if it is found to be faulty. Additionally, repairing any damaged wiring or connectors in the sensor circuit, replacing blown fuses, or addressing ECM issues may be necessary to resolve the fault code.
How to erase DTC P1155 on BMW
After fixing the underlying issue causing DTC P1155 on a BMW, the fault code can be erased using a diagnostic scanner capable of clearing trouble codes. Once the code is cleared, the Check Engine Light should turn off, indicating 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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.