What it means
The pumping current of the intake air oxygen sensor on bank 2 reports a circuit high 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 a pump cell, and the control module monitors its pumping-current circuit to regulate intake-side lambda. P2AEE sets when the circuit is electrically high, which can point to a wire shorted to battery voltage or an open pump cell.
Common causes
Most likely first.
- Pump current wire shorted to B+
- Open pump cell
- Connector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
How to diagnose it
- Capture freeze-frame data and check bank 2 intake-air sensor readings and fuel corrections to identify when the high condition occurs.
- Inspect the bank 2 sensor connector for corrosion, poor seating, or damaged terminals.
- Trace the pump-current wire and look for melted insulation or contact with a battery-voltage source.
- Use the manufacturer's diagram and specified test method to check for a short to battery voltage with the sensor and module isolated as directed.
- If no harness short is found, test the bank 2 sensor pump cell to the manufacturer's specification for an internal open.
Common fixes
- Repair the pump-current wire if it is shorted to battery voltage.
- Clean, secure, or replace corroded or damaged bank 2 connector terminals.
- Repair wiring damaged by heat or rubbing in the sensor harness.
- Replace the bank 2 intake-air oxygen sensor if its pump cell is internally open.
Can I keep driving?
You can usually make a short, gentle trip if the engine runs normally, but fuel economy and emissions may worsen while bank 2 intake-side regulation is impaired. Avoid continued driving if it hesitates or runs roughly.
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.