P2AEB: Intake Air O2 Sensor Pumping Current Trim Circuit High Bank 2

P2AEB indicates excessive voltage on the trim wire serving the second bank's intake O2 sensor. A short to the heater or another supply wire, or moisture bridging contacts in the plug, can lift the line; Saab's 2010 9-5 test procedure for the comparable exhaust probe expects roughly 2.8 V on its trim terminal at ignition-on, so a reading near battery voltage is a clear sign. Ford's exhaust analog for bank 2 is P2631, used only on NTK probes for a trim lead shorted to battery. For an intake sensor on bank 2 no manufacturer documentation exists; CARB's comprehensive-component rule is the basis. Since the resistor sets the characteristic, a falsified trim value shifts the oxygen reading and with it the EGR calculation of that bank. P2AEA is low, P2AE9 open, P2AE2 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 reduced, NOx may rise

Most likely causes

• Trim lead shorted to the heater or another supply
• Moisture bridging contacts in the plug
• Internal short in the sensor connector module

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 P2AEB means

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

Frequently asked questions

Can I keep driving with code P2AEB?

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 P2AEB?

The most common causes are: trim lead shorted to the heater or another supply; moisture bridging contacts in the plug; internal short in the sensor connector module.

Related codes

• P2AE9Intake Air O2 Sensor Pumping Current Trim Circuit Open Bank 2
• P2AEAIntake Air O2 Sensor Pumping Current Trim Circuit Low Bank 2
• P2AE2Intake Air O2 Sensor Pumping Current Trim Circuit High Bank 1
• P2AEEIntake Air O2 Sensor Pumping Current Circuit High Bank 2
• P2631O2 Sensor Pumping Current Trim Circuit High (Bank 2 Sensor 1)

Sources

• saabwisonline.com: dtc p2237 p2239 p2243 p2251 or p2626
• newtonnet.co.uk: fordobd2012
• bosch-motorsport.com: Data Sheet 69034379 Lambda Sensor LSU 4.9
• 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.