P2A3D

O2 Sensor Negative Current Control Circuit High Bank 1 Sensor 3

Moderate severity

Voltage on the wide-band oxygen sensor negative pump current line of bank 1 sensor 3 is above the expected window. Wire shorted to B+ or pump cell open.

Common causes

Pump current wire shorted to B+
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $170-770
Open pump cell
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $170-770
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P2A3D.
Unlock causes
Free forever · No credit card

First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

Get the full step-by-step diagnosis

Create a free Wrenchify account to unlock the rest for P2A3D.

Unlock diagnosis

Free forever · No credit card

Related codes

See related trouble codes

Create a free Wrenchify account to unlock the rest for P2A3D.

Unlock related codes

Free forever · No credit card

Frequently asked questions

What does P2A3D mean?

P2A3D means "O2 Sensor Negative Current Control Circuit High Bank 1 Sensor 3". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.

What are the most common causes of P2A3D?

pump current wire shorted to b+; open pump cell; connector pins corroded - high contact resistance — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

Get the full P2A3D diagnosis for your vehicle

Year, make, model + step-by-step repair help — free plan included.

Diagnose P2A3D