P2271

O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$28–89 (est.)

Symptoms

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

Causes

Oxygen sensor malfunction
Exhaust gas leak in front of the sensor
Problems with fuel injectors (overflow)
EVAP system malfunction
Damage to sensor wiring

How to Fix

Check the condition of the oxygen sensor and its connector
Check the exhaust system for leaks
Diagnose the operation of fuel injectors
Check EVAP system for leaks
Replace the oxygen sensor if necessary

Related codes

P2270 P2272 P0136