BMW DTC P1187 – O2 Sensor Heater Control Circuit (Bank 2 Sensor 2)
DTC P1187 meaning on BMW
DTC P1187 on a BMW indicates an issue with the O2 sensor heater control circuit for Bank 2 Sensor 2. This fault code specifically points to a malfunction in the heating element of the downstream oxygen sensor located on the side of the engine that does not contain the number one cylinder.
BMW DTC P1187 symptoms
Symptoms of DTC P1187 on a BMW may include poor fuel economy, rough idling, hesitation during acceleration, and an illuminated check engine light on the dashboard. Additionally, the vehicle may fail an emissions test due to increased emissions output.
BMW DTC P1187 causes
The most common causes of DTC P1187 on a BMW are a faulty O2 sensor heater, damaged wiring or connectors in the O2 sensor circuit, or a blown fuse related to the O2 sensor heater circuit. Environmental factors such as exposure to moisture or corrosion can also contribute to this issue.
BMW DTC P1187 seriousness
While DTC P1187 is not a critical issue that will cause immediate harm to the vehicle, it should be addressed promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance. Ignoring this fault code may lead to increased emissions and decreased fuel efficiency.
How to diagnose DTC P1187 on BMW
To diagnose DTC P1187 on a BMW, a mechanic will typically use a diagnostic scanner to retrieve the fault code and perform a visual inspection of the O2 sensor and its wiring. They may also test the O2 sensor heater circuit for continuity and check for any blown fuses related to the sensor.
How to fix DTC P1187 on BMW
Fixing DTC P1187 on a BMW usually involves replacing the faulty O2 sensor heater, repairing any damaged wiring or connectors in the circuit, and ensuring that the fuse related to the O2 sensor heater is intact. Once the issue is resolved, the fault code should be cleared from the vehicle’s memory.
How to erase DTC P1187 on BMW
To erase DTC P1187 on a BMW, a diagnostic scanner can be used to clear the fault code from the vehicle’s ECU. After the repair has been completed and the underlying issue resolved, the fault code should be cleared to turn off the check engine light and ensure that the repair was successful.
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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