P2AEC: Intake Air O2 Sensor Pumping Current Circuit Open Bank 2

P2AEC means the pumping current wire of the second-bank intake oxygen sensor is interrupted. On a Bosch-style element the ECM uses this lead to push oxygen into or out of the measuring gap until the Nernst cell is balanced; the current needed is the oxygen signal. Ford's intake EGR patent US9441564B2 derives the recirculated share from the change in that current relative to operation without EGR, so an open lead removes the whole basis. For bank 2 exhaust probes Ford uses P2240, found by a lambda that hardly moves under test pulses. No manufacturer has published P2AEC or an engine fitted with a separate bank 2 intake sensor. Look first at wiring routed near hot exhaust parts of that bank. P2AED/P2AEE are low/high, P2AEF the open return, P2AE3 bank 1.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

• Check engine light on
• EGR on bank 2 without feedback or switched off

Most likely causes

• Pump current lead broken, often from heat near bank 2 exhaust
• Sensor plug loose or not latched
• Pump cell inside the sensor open

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 continuity of the wire between the component and the control module.
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 P2AEC means

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

Frequently asked questions

Can I keep driving with code P2AEC?

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 P2AEC?

The most common causes are: pump current lead broken, often from heat near bank 2 exhaust; sensor plug loose or not latched; pump cell inside the sensor open.

Related codes

• P2AEDIntake Air O2 Sensor Pumping Current Circuit Low Bank 2
• P2AEEIntake Air O2 Sensor Pumping Current Circuit High Bank 2
• P2AEFIntake Air O2 Sensor Negative Current Control Circuit Open Bank 2
• P2AE3Intake Air O2 Sensor Pumping Current Circuit Open Bank 1
• P2240O2 Sensor Positive Current Control Circuit/Open (Bank 2 Sensor 1)

Sources

• patents.google.com: en
• newtonnet.co.uk: fordobd2012
• 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.