DTC Troubleshooting: P2271
DTC P2271: Secondary HO2S (Sensor 2) Circuit Signal Stuck Rich
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P2271 Secondary HO2S (Sensor 2) Circuit Signal Stuck Rich
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine.

?4.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

?5.
Test-drive under these conditions:
Engine speed between 1,200?4,520 rpm
Vehicle speed of 3 mph (5 km/h) or more, for at least 2 minutes

NOTE: Test-drive under the same conditions with the on-board snapshot of this DTC is recorded.

Signal
Current conditions
Values
Unit
ECT SENSOR 1
    
VEHICLE SPEED
    
ENGINE SPEED
    

?6.
Monitor the OBD STATUS for DTC P2271 in the DTCs MENU with the HDS.
DTC Description
OBD Status
P2271 Secondary HO2S (Sensor 2) Circuit Signal Stuck Rich
  

Does the HDS indicate FAILED?

     
YES
     
     
     
     
NO
     
     
     
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 1-3 and recheck.?