Powertrain, generic (extended)

P2AE5 Intake Air O2 Sensor Pumping Current Circuit High Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2AE5 is the high-side fault of the pumping current lead on the bank 1 intake oxygen sensor. A short to the heater supply or another battery feed in the harness is the classic cause; because the intake sensor works in damp air close to where blow-by gas and EGR enter, water in the plug comes next. Ford files a pump lead touching battery voltage on its exhaust probes as P0132, while Saab's 9-5 (2010) uses the high code P2239 when the signal stays between 1.48 and 1.51 V for 1 s despite enrichment, a Type B fault. Neither applies directly to the intake, and no manufacturer documents P2AE5 publicly; CARB supplies the obligation to catch out-of-range inputs. A shorted pump wire can damage the sensor interface in the ECM, so measure before swapping parts. P2AE4 is low, P2AEE bank 2.

Likely causes

Pump current lead shorted to the heater or another supply
Water or condensate in the sensor plug
Sensor interface in the ECM damaged by the short

Symptoms

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

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–450
Time0.3–2.5 h

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

Parts involved

intake air o2 sensor b1wiring harnessecm

Related codes

P2AE3P2AE4P2AEEP2AE2P2239

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