What it means
The positive (sourcing) side of the O2 sensor pumping current control circuit on bank 2 sensor 2 is open. Wide-band O2 sensors regulate oxygen concentration in a reference chamber by pumping current; the positive line is open here.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 2 Sensor 2 is the downstream oxygen sensor on the bank opposite the one containing cylinder 1. In a wide-band sensor, the module uses positive and negative current-control paths to regulate oxygen in a reference chamber; this code sets when the positive, or sourcing, current-control path is open.
Common causes
Most likely first.
- Open positive current line
- Pin pushed back out of connector body
- Cracked solder joint inside the module or sensor
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
How to diagnose it
- Record freeze-frame data and check live Bank 2 Sensor 2 readings for signs the module has lost control of the downstream sensor.
- Inspect the positive current-control wire and connector for heat damage, corrosion, breaks, or a pin pushed back into the connector body.
- Use the wiring diagram to trace the positive current path and test continuity according to the manufacturer's procedure.
- Check connector pin retention and terminal contact at the sensor and module ends of the circuit.
- If the external wiring is intact, use the manufacturer's tests to determine whether the sensor or control module has an internal open.
Common fixes
- Reseat a displaced Bank 2 Sensor 2 connector pin and secure the connector.
- Repair an open or damaged positive current-control wire.
- Repair poor terminal contact or corrosion in the positive current path.
- Replace the sensor or repair the module only if the manufacturer's tests identify an internal failure.
Can I keep driving?
If the engine runs normally and the warning light is steady, a short drive may be possible, but avoid unnecessary trips and arrange diagnosis soon. The downstream sensor may not be controlled or monitored correctly, which can affect emissions and fuel economy.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.