P239E

O2 Sensor Out of Range During Deceleration Bank 1 Sensor 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–67 (est.)

Symptoms

Increased fuel consumption
Unstable engine operation when decelerating
Check Engine light comes on
Increased emissions of harmful substances
Reduced engine power

Causes

Malfunction of oxygen sensor bank 1 sensor 2
Damaged or corroded sensor wiring
Leak in the exhaust system
Problems with the fuel system
Malfunction of the catalytic converter

How to Fix

Check the condition of the oxygen sensor and its connector
Inspect the sensor wiring for damage
Check the exhaust system for leaks
Test the operation of the fuel system
If necessary, replace the oxygen sensor

Related codes

P239F P239D P2390