P2A3C

O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 3

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$22–56 (est.)

Symptoms

Check Engine light comes on
Deterioration in fuel consumption
Reduced engine power
Unstable engine operation at idle

Causes

Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Oxygen sensor malfunction
Problems with the engine control unit (ECU)

How to Fix

Check the integrity of the sensor wiring and connectors
Measure the resistance and voltage in the sensor circuit
Replace the oxygen sensor if necessary
Check and, if necessary, replace the engine control unit

Related codes

P2A3D P2A3B P0137