P1087 BMW O2 Sensor Circuit Slow Response in Lean Control Range Bank 1 Sensor 1

Possible causes

– Faulty O2 Sensor Bank 1 Sensor 1
– O2 Sensor Bank 1 Sensor 1 harness is open or shorted
– O2 Sensor Bank 1 Sensor 1 circuit poor electrical connection

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)