DTC P3021 BMW
O2S Sensor Signal Voltage Too Low During Coast Down Fuel Cut-Off Due to Open Pumping Current Circuit (Bank 2 Sensor 1)
O2S Sensor Signal Voltage Too Low During Coast Down Fuel Cut-Off Due to Open Pumping Current Circuit (Bank 2 Sensor 1)
Description
Engine started and the fault monitoring criterion must remain present for over 2 seconds, battery voltage must be at least 11v, and the voltage at CJ125 is at 1.5v so the sensor is heated adequately, there is an open pump current wire.
Cause and Solution
Check plugs
Check wiring harness
Video Guide
Diagnostic Info
- DTC Code: P3021
- Brand: BMW