P2AEE

Code

Generic P — Powertrain

Intake Air O2 Sensor Pumping Current Circuit High Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 44 EN: 77 RU: 51

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Page language: EN

Causes

Failed wideband (pumping cell) intake O2 sensor on Bank 2
Short to voltage in the pump cell signal wiring
Poor or corroded connector or pin at the sensor
Open or high-resistance ground or reference for the sensor circuit
Faulty sensor heater or incorrect heater supply affecting sensor operation
ECM/PCM internal fault or incorrect calibration/software

Symptoms

Check Engine Light (MIL) illuminated
Poor idle quality or hesitation
Reduced fuel economy
Rough running after cold start or during transitions
Failed emissions test or high/erratic lambda/readings on scan tool

What to check

Read freeze frame and full DTC report; note related codes (heater faults, bank 2 O2 codes).
Use a scan tool to monitor wideband O2 (pump current / lambda) live data for Bank 2.
Visually inspect wiring, harness routing, and sensor connector for damage or corrosion.
Check sensor connector pins for bent, pushed-out, or corroded terminals.
Verify power and ground to the sensor (fuse, relay, ECM supply and ground).
Measure sensor heater resistance and verify heater supply voltage with key on.

Signal parameters

Sensor type: wideband/UEGO with a pump cell and reference cell (Bank 2 intake upstream).
Pumping current is typically a small value (microamps to low milliamps) and varies around zero near stoichiometry — manufacturer-specific thresholds apply.
'Circuit High' means the measured pump current is higher than the ECM upper threshold for that vehicle; consult service manual for exact limits.
Heater circuit: normally supplied with switched 12V and measured heater resistance per spec (check OEM data).
Signal wiring commonly includes pump cell signal, reference/ground, heater +12V and heater ground — pinout is vehicle-specific.

Diagnostic algorithm

Record related codes and freeze-frame data. Clear codes and attempt to re-run to confirm repeatability.
Use a professional scan tool to view live pump current (or lambda), heater status, and other O2 sensors; compare Bank 1 vs Bank 2 behavior.
Perform visual inspection of the Bank 2 intake O2 sensor and harness for damage, burns, oil soak, or contamination.
Verify connector integrity: unplug, inspect terminals, clean if necessary, then reconnect securely.
Check power and ground: with key ON, verify heater supply voltage at the connector fuse/relay and a good ground reference to chassis/ECM.
Measure heater resistance at the sensor and compare to spec; if open/shorted, replace sensor.
Backprobe pump cell signal and reference/ground with engine running (or during a live test) and observe values; check for steady abnormal high current or transients when manipulating wiring.
If wiring or connector faults are found, repair the wiring harness (replace damaged sections, terminals, or connector).
If wiring checks good and heater/power OK but pump current remains high, replace the wideband intake O2 sensor on Bank 2 with OEM or approved equivalent.
If code persists after sensor replacement, suspect ECM/PCM fault or calibration — consult OEM technical service bulletins and consider ECU testing/reprogramming at a dealer-level facility.
After repairs, clear codes and perform drive cycle or readiness checks to confirm the fault does not return.

Likely causes

Damaged/frayed wiring shorted to battery voltage
Corroded or water-intruded sensor connector
Sensor aged or contaminated (soot, oil, coolant)
Blown fuse or fault in the sensor 12V heater supply or ground
ECU intermittent fault (less common)

Fault status

⚠️ Status

Intake-air wideband O2 sensor (pump cell) circuit on Bank 2 reports abnormally high pumping current. Inspect sensor, wiring/connectors, heater supply/ground, and ECM inputs.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours