P2AE1: Intake Air O2 Sensor Pumping Current Trim Circuit Low Bank 1

P2AE1 is stored when the voltage on the trim circuit of the bank 1 intake oxygen sensor falls below its window. With the ignition on, the 2010 Saab 9-5 expects roughly 2.8 V on terminal 5 of its wide-band probe, the trim connection; a value near zero suggests a lead rubbing on ground or a shorted resistor in the sensor plug. Ford's 2012 summary shows how makers sort such faults differently: on NTK probes an open and a grounded trim lead (RL) both set the low code P2627, while on Bosch probes a grounded IA lead lands in P0131. No manufacturer publishes P2AE1 for an intake sensor. With the trim value missing, the EGR rate derived from the oxygen reading becomes unreliable, so recirculation is cut back. P2AE0 is the open, P2AE2 the high fault, P2AEA 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 cut back, possibly higher NOx

Most likely causes

• Trim lead chafed through to ground
• Calibration resistor in the sensor plug shorted
• Open trim lead on sensors whose interface reports it as low

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. With the connector unplugged, check whether the signal wire is making contact with ground.
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 P2AE1 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• A: Hybrid or air and fuel
• E1: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2AE1?

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 P2AE1?

The most common causes are: trim lead chafed through to ground; calibration resistor in the sensor plug shorted; open trim lead on sensors whose interface reports it as low.

Related codes

• P2AE0Intake Air O2 Sensor Pumping Current Trim Circuit Open Bank 1
• P2AE2Intake Air O2 Sensor Pumping Current Trim Circuit High Bank 1
• P2AEAIntake Air O2 Sensor Pumping Current Trim Circuit Low Bank 2
• P2AE4Intake Air O2 Sensor Pumping Current Circuit Low Bank 1
• P2627O2 Sensor Pumping Current Trim Circuit Low (Bank 1 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.