P2AC6

Intake Air O2 Sensor Reference Voltage Circuit High Bank 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–89 (est.)

Symptoms

Increased fuel consumption
Unstable engine operation
Reduced engine power
Check Engine Light Illuminates
Dips during acceleration

Causes

Malfunction of the oxygen sensor in the intake
Open or short circuit in wiring
Problems with sensor connectors
Engine control unit malfunction
Contact corrosion

How to Fix

Check the integrity of wiring and connectors
Check the resistance of the oxygen sensor
Check the reference voltage in the sensor circuit
Replace the oxygen sensor if necessary
Check and update the ECU firmware

Related codes

P2AC5 P2AC7 P2AC8