P2AE5: Intake Air O2 Sensor Pumping Current Circuit High Bank 1

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.

Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the wiring and connector of the sensor indicated
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Look for exhaust leaks
4. Check the signal in live data with the engine warm
5. Check the fuse and the heater resistance if the code mentions it
6. Replace the sensor if it has power and does not respond

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P2AE5 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• A: Hybrid or air and fuel
• E5: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2AE5?

Yes, you can normally drive in moderation, but get it repaired soon: you will use more fuel and the catalytic converter can be damaged over time.

What causes code P2AE5?

The most common causes are: 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.

Related codes

• P2AE3Intake Air O2 Sensor Pumping Current Circuit Open Bank 1
• P2AE4Intake Air O2 Sensor Pumping Current Circuit Low Bank 1
• P2AEEIntake Air O2 Sensor Pumping Current Circuit High Bank 2
• P2AE2Intake Air O2 Sensor Pumping Current Trim Circuit High Bank 1
• P2239O2 Sensor Positive Current Control Circuit High (Bank 1 Sensor 1)

Sources

• newtonnet.co.uk: fordobd2012
• saabwisonline.com: dtc p2237 p2239 p2243 p2251 or p2626
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.