What it means
The pumping current of the intake air oxygen sensor on bank 2 reports a circuit open condition. Wide-band lambda regulation on the intake side is impaired.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The wide-band intake-air oxygen sensor on bank 2 uses pump current to help the control module assess oxygen in incoming air. P2AEC sets when the module detects an open in the sensor’s pumping-current circuit, interrupting the control path used for intake-side lambda regulation.
Common causes
Most likely first.
- Open in pump current wire
- Internal open in pump cell
- Pin pushed back out of connector body
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 review bank 2 intake-air sensor readings and fuel corrections to understand when the open is detected.
- Locate the bank 2 intake-air oxygen sensor and inspect its connector for a pushed-back pin, poor seating, or damage.
- Follow the pump-current wire from the sensor and check for a break, chafing, or heat damage along the harness.
- With components isolated as directed by the manufacturer, check continuity through the pump-current wire and connector terminals.
- If the external circuit is intact, test the bank 2 sensor pump cell according to the manufacturer's procedure for an internal open.
Common fixes
- Reseat the bank 2 sensor connector or a displaced terminal.
- Repair a broken pump-current wire in the bank 2 harness.
- Replace a damaged connector terminal or repair a poor connection.
- Replace the bank 2 intake-air oxygen sensor if its pump cell is internally open.
Can I keep driving?
If the engine runs normally, a short, gentle drive is usually possible, but fuel consumption and emissions may rise because bank 2 intake-side regulation is impaired. Avoid longer trips if hesitation or rough idle occurs.
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.