Powertrain, generic (extended)

P2AE4 Intake Air O2 Sensor Pumping Current Circuit Low Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2AE4 flags too low a level in the pumping current circuit belonging to the bank 1 intake sensor, usually a pump lead chafed through to ground or an internal short in the pump cell. Saab's 2010 9-5 gives a useful reference for the same wire on its exhaust probe: about 2.8 V on terminal 1 at ignition-on with the sensor unplugged, and its low code P2238 sets when the signal stays under 1.7 V for 3 s on overrun. Ford instead stores a grounded IP lead as P0131. No maker documents P2AE4 for an intake sensor. Because the ECM can no longer pump oxygen through the cell, it loses the value it compares with the zero point learned without EGR, and recirculation is reduced or switched off. P2AE3 is the open lead, P2AE5 the high side, P2AED bank 2.

Likely causes

Pump current lead shorted to ground
Internal short in the pump cell
Sensor interface in the ECM faulty

Symptoms

  • Check engine light on
  • EGR reduced or switched off
  • Possibly higher NOx at an emissions test

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 b1wiring harnessecm

Related codes

P2AE3P2AE5P2AEDP2AE1P2238

References: saabwisonline.com, newtonnet.co.uk, patents.google.com, law.cornell.edu.