The code indicates that the oxygen sensor circuit for bank 2, sensor 1 is not sending a proper pumping current signal, meaning the sensor's internal circuit is open or not functioning as expected.
The sensor's internal pumping current circuit can fail, causing an open condition that triggers the code.
Corrosion, broken wires, or loose pins in the sensor circuit can interrupt the pumping current signal.
A leak upstream can alter exhaust gas composition and affect sensor operation, leading to an open circuit reading.
A rare PCM fault can cause loss of signal to the sensor circuit, but this is uncommon compared to sensor or wiring issues.
No, PCM failure is uncommon; most cases are resolved by repairing or replacing the sensor or fixing wiring/connector issues.
A catalytic converter problem does not directly cause an open pumping current circuit; it may trigger different codes related to efficiency.
The code can affect fuel trims indirectly if the sensor's signal is lost, but the primary issue is the sensor's pumping current circuit.