P2AE0 — Intake Air O2 Sensor Pumping Current Trim Circuit Open Bank 1

Diagnostic algorithm

1. Verify and record all related codes and freeze-frame data; do not clear codes yet. 2) Visually inspect the Bank 1 A/F sensor connector and harness from sensor to ECM; repair any obvious damage. 3) With ignition off, disconnect the sensor and inspect connector pins for corrosion, bent or pushed-out pins. 4) With a DVOM, check continuity between the sensor’s pumping-current terminal and the corresponding ECM pin; expect near-zero ohms (vehicle-specific). 5) Check for shorts to battery and to ground on the pumping-current circuit. 6) With engine running and a scan tool, monitor the A/F sensor pumping current or lambda parameter while manipulating air/fuel conditions; verify sensor responds. 7) Verify sensor heater power and ground, and that the sensor reaches operating temperature (heater resistance and voltage checks). 8) If wiring and power/ground are good but sensor shows no pumping current, replace the A/F (wideband) sensor. 9) If a new sensor also shows open circuit but wiring checks good, suspect ECM fault and consult vehicle manufacturer guidance before replacement. 10) After repair, clear codes and road-test to confirm the code does not return and the sensor reports normal behaviour.