P2AC3

Intake Air O2 Sensor Reference Voltage Circuit/Open Bank 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–78 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Unstable engine idling
Possible problems starting the engine

Causes

Open or short circuit in the oxygen sensor circuit
Poor contact in the sensor connector
Malfunction of the O2 sensor itself
Wiring harness damage
Problems with the engine control unit (ECU)

How to Fix

Check the integrity of the sensor wiring and connectors
Check the sensor supply voltage
Test the oxygen sensor for compliance with specifications
Replace O2 sensor if necessary
Check the condition of the fuse for the corresponding circuit

Related codes

P2AC0 P2AC1 P2AC4