Powertrain, generic (extended)

P2AE1 Intake Air O2 Sensor Pumping Current Trim Circuit Low Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2AE1 is stored when the voltage on the trim circuit of the bank 1 intake oxygen sensor falls below its window. With the ignition on, the 2010 Saab 9-5 expects roughly 2.8 V on terminal 5 of its wide-band probe, the trim connection; a value near zero suggests a lead rubbing on ground or a shorted resistor in the sensor plug. Ford's 2012 summary shows how makers sort such faults differently: on NTK probes an open and a grounded trim lead (RL) both set the low code P2627, while on Bosch probes a grounded IA lead lands in P0131. No manufacturer publishes P2AE1 for an intake sensor. With the trim value missing, the EGR rate derived from the oxygen reading becomes unreliable, so recirculation is cut back. P2AE0 is the open, P2AE2 the high fault, P2AEA bank 2.

Likely causes

Trim lead chafed through to ground
Calibration resistor in the sensor plug shorted
Open trim lead on sensors whose interface reports it as low

Symptoms

  • Check engine light on
  • EGR cut back, possibly higher NOx

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

P2AE0P2AE2P2AEAP2AE4P2627

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