Powertrain, generic (extended)

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

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2AE0 says the calibration (trim) wire of bank 1's intake O2 sensor has lost continuity. On a Bosch-type wide-band element this is pin 5 (RT/IA), which connects a resistor in the plug that Bosch uses to set the characteristic of each individual sensor; without it the ECM scales the oxygen signal wrongly. No manufacturer documents P2AE0 publicly, and no bulletin lists it. On exhaust probes Ford spots an open IA line (P2626) on overrun with the injectors cut: if the pumping current in pure air stays above roughly 3.1 mA for 2 s, the code sets. Saab's 2010 9-5 uses a 4.81 V limit in the same situation. Ford's EGR patent also learns the intake sensor's zero point at idle or during fuel cut, so a wrong air reading skews the EGR estimate. P2AE1/P2AE2 are low/high, P2AE9 bank 2.

Likely causes

Trim lead (pin 5) broken in the harness
Trim contact pushed back or corroded in the sensor plug
Calibration resistor inside the sensor connector open

Symptoms

  • Check engine light on
  • EGR reduced or run without oxygen feedback
  • NOx emissions 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 b1wiring harnessecm

Related codes

P2AE1P2AE2P2AE9P2AE3P2626

References: newtonnet.co.uk, saabwisonline.com, bosch-motorsport.com, patents.google.com.