P23A1

O2 Sensor Exhaust Sample Error Bank 2 Sensor 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine light comes on
Increased fuel consumption
Reduced engine power
Unstable operation at idle
Increased level of harmful emissions

Causes

Oxygen sensor malfunction
Open or short circuit in the sensor circuit
Sensor contamination (oil, antifreeze)
Problems with the catalytic converter
Poor contact in the sensor connector

How to Fix

Check the condition of the oxygen sensor
Check the integrity of the circuit and connectors
Clean sensor contacts
Replace sensor if necessary
Check the condition of the catalytic converter

Related codes

P23A0 P23A2 P0138