P2AC2

Intake Air O2 Sensor Reference Voltage Circuit High Bank 1

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine light comes on
Deterioration of vehicle dynamics
Increased fuel consumption
Unstable engine operation at idle
Possible misfires

Causes

Malfunction of the oxygen sensor in the intake
Open or short circuit in wiring harness
Poor contact in sensor connectors
Sensor power problems
Engine ECU malfunction

How to Fix

Check the integrity of the sensor wiring harness
Check sensor connectors and contacts
Measure resistance and voltage at the sensor
Replace the oxygen sensor if necessary
Test the operation of the system after repair

Related codes

P2AC1 P2AC3 P2AC4