P2ABF

Intake Air O2 Sensor Reference Voltage Circuit/Open Bank 1

Moderate severity

The reference voltage supplied to the intake air oxygen sensor on bank 1 reports a circuit fault/open condition. Lambda measurement on the intake side is unreliable.

Common causes

Open in reference voltage wire
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $220-990
Intake air O2 sensor failed
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $220-990
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P2ABF.
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 P2ABF.

Unlock diagnosis

Free forever · No credit card

Related codes

See related trouble codes

Create a free Wrenchify account to unlock the rest for P2ABF.

Unlock related codes

Free forever · No credit card

Frequently asked questions

What does P2ABF mean?

P2ABF means "Intake Air O2 Sensor Reference Voltage Circuit/Open Bank 1". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.

What are the most common causes of P2ABF?

open in reference voltage wire; intake air o2 sensor failed; 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.

Get the full P2ABF diagnosis for your vehicle

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

Diagnose P2ABF