P2A3B

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

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$22–89 (est.)

Symptoms

Check Engine Light Is On
Increased fuel consumption
Reduced engine power
Unstable engine idling
Dips during acceleration

Causes

Open or short circuit in the sensor control circuit
Poor contact in the sensor connector
Oxygen sensor malfunction
Wiring Harness Problems
Engine control unit malfunction

How to Fix

Check the integrity of the sensor control circuit
Inspect the connectors and contacts of the sensor
Check the resistance and voltage at the sensor
Replace the faulty oxygen sensor if necessary
Test the operation of the system after repair

Related codes

P2A3A P2A3C P0138