P2AE0: Intake Air O2 Sensor Pumping Current Trim Circuit Open Bank 1

P2AE0 says the calibration (trim) wire of bank 1's intake O2 sensor has lost continuity. On a Bosch-type wide-band element this is pin 5 (RT/IA), which connects a resistor in the plug that Bosch uses to set the characteristic of each individual sensor; without it the ECM scales the oxygen signal wrongly. No manufacturer documents P2AE0 publicly, and no bulletin lists it. On exhaust probes Ford spots an open IA line (P2626) on overrun with the injectors cut: if the pumping current in pure air stays above roughly 3.1 mA for 2 s, the code sets. Saab's 2010 9-5 uses a 4.81 V limit in the same situation. Ford's EGR patent also learns the intake sensor's zero point at idle or during fuel cut, so a wrong air reading skews the EGR estimate. P2AE1/P2AE2 are low/high, P2AE9 bank 2.

Medium severity. Can I keep driving?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.

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

Symptoms

Check engine light on
EGR reduced or run without oxygen feedback
NOx emissions may rise

Most likely causes

Trim lead (pin 5) broken in the harness
Trim contact pushed back or corroded in the sensor plug
Calibration resistor inside the sensor connector open

What to check, in order

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

Check the wiring and connector of the sensor indicated
Check the continuity of the wire between the component and the control module.
Look for exhaust leaks
Check the signal in live data with the engine warm
Check the fuse and the heater resistance if the code mentions it
Replace the sensor if it has power and does not respond

Good to know

Repair difficulty: medium
It affects emissions.

What each character of P2AE0 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
A: Hybrid or air and fuel
E0: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2AE0?

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 P2AE0?

The most common causes are: trim lead (pin 5) broken in the harness; trim contact pushed back or corroded in the sensor plug; calibration resistor inside the sensor connector open.

Related codes

Sources

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.