P2A38

O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 3

Moderate severity

The control circuit for the wide-band oxygen sensor positive current pump on bank 1 sensor 3 is open. Pumping current cannot be applied for lambda regulation.

Common causes

Open in pump current wire
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $170-770
Internal open in pump cell
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $170-770
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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.

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Related codes

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Frequently asked questions

What does P2A38 mean?

P2A38 means "O2 Sensor Positive Current Control Circuit/Open 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 P2A38?

open in pump current wire; internal open in pump cell; pin pushed back out of connector body — 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.

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