Powertrain, generic (extended)

P2AEB Intake Air O2 Sensor Pumping Current Trim Circuit High Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2AEB indicates excessive voltage on the trim wire serving the second bank's intake O2 sensor. A short to the heater or another supply wire, or moisture bridging contacts in the plug, can lift the line; Saab's 2010 9-5 test procedure for the comparable exhaust probe expects roughly 2.8 V on its trim terminal at ignition-on, so a reading near battery voltage is a clear sign. Ford's exhaust analog for bank 2 is P2631, used only on NTK probes for a trim lead shorted to battery. For an intake sensor on bank 2 no manufacturer documentation exists; CARB's comprehensive-component rule is the basis. Since the resistor sets the characteristic, a falsified trim value shifts the oxygen reading and with it the EGR calculation of that bank. P2AEA is low, P2AE9 open, P2AE2 bank 1.

Likely causes

Trim lead shorted to the heater or another supply
Moisture bridging contacts in the plug
Internal short in the sensor connector module

Symptoms

  • Check engine light on
  • EGR on bank 2 reduced, NOx may rise

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–350
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

intake air o2 sensor b2wiring harnessecm

Related codes

P2AE9P2AEAP2AE2P2AEEP2631

References: saabwisonline.com, newtonnet.co.uk, bosch-motorsport.com, law.cornell.edu.