P2AE9

Code

Generic P — Powertrain

Intake Air O2 Sensor Pumping Current Trim Circuit Open Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 20 EN: 29 RU: 14

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Open or broken wiring in the pump-current/trim conductor between the sensor and ECM
Corroded, loose or damaged sensor connector or ECU connector pins
Faulty intake air O2 (wideband/UEGO) sensor (pump cell damaged)
Poor or missing ground or reference at the sensor or ECM
High resistance in wiring or splice (intermittent open)
ECM internal fault or damaged input circuit

Use a scan tool: read DTCs, freeze frame, and live data for Bank 2 UEGO/pump current and O2 heater status
Verify whether heater circuit for the sensor is operating (heater on after start) using scanner or DVOM
Visually inspect the Bank 2 intake O2 sensor, wiring harness and connector for damage, corrosion, pin push-out or heat damage
Wiggle test wiring/connectors while monitoring live data to identify intermittent opens
Backprobe the sensor connector and measure continuity to the ECM pump-current terminal with ignition off
Check for related codes that can point to wiring or ground faults (heater faults, sensor circuit faults)

Pump-current/pump cell signal: should be within manufacturer-specified range and change with AFR (wideband UEGO output is a current/pulse related value)
Heater circuit: supply voltage ~12 V when heater commanded, or as specified by manufacturer
Sensor ground/reference: low resistance to ECU ground (< a few ohms)
Open-circuit detection: infinite/very high resistance between pump pin and ECM indicates open

Record codes and freeze-frame data. Confirm P2AE9 is current and note any other O2-related codes.
Inspect sensor and harness visually for burns, breaks, rodent damage, or corroded connectors on Bank 2 intake O2 sensor.
With ignition off, disconnect the sensor connector and check pin condition. Check continuity from the sensor pump-current pin to the ECM connector pin; expect low resistance. No continuity = open wiring.
If continuity exists, measure resistance of pump cell per manufacturer spec (if available). An open (infinite) pump cell indicates a bad sensor.
With a scan tool or oscilloscope, monitor pump-current and O2 output while commanding different AFRs (snap throttle, rich/lean inputs) to confirm the sensor changes. If signal is absent, suspect wiring or sensor.
Verify heater circuit operation (voltage present when commanded). A failed heater may indicate sensor damage or a separate wiring fault; repair as needed.
Inspect and test grounds and reference circuits for the sensor and ECM. Repair any high-resistance connections.
If wiring and connectors are good and sensor checks fail, replace the intake air wideband O2 sensor on Bank 2 and clear codes. Re-test to verify repair.
If replacement sensor does not clear the code, perform direct continuity/resistance checks at the ECM connector. If ECM input is open or shorted, consult manufacturer resources; ECM replacement or repair may be required.