DTC Troubleshooting: P2270
DTC P2270: Secondary HO2S (Sensor 2) Circuit Signal Stuck Lean
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P2270 Secondary HO2S (Sensor 2) Circuit Signal Stuck Lean
    

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 (CVT in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?5.
Test-drive the vehicle under these conditions:
Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
CVT in D, M/T in 4th
Engine speed between 1,500?3,000 rpm
Drive 30 seconds or more

Signal
Current conditions
Values
Unit
ECT SENSOR 1
    
ENGINE SPEED
    

?6.
Monitor the OBD STATUS for DTC P2270 in the DTCs MENU with the HDS.
DTC Description
OBD Status
P2270 Secondary HO2S (Sensor 2) Circuit Signal Stuck Lean
  

Does the HDS indicate FAILED?

     
YES
     
     
     
The failure is duplicated. Replace secondary HO2S (Sensor 2).?
     
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.?