DTC Troubleshooting: P2270, P2272
DTC P2270: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean
DTC P2272: Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean
NOTE:
Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
Information marked with an asterisk (*) applies to the front bank (Bank 2).

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2270 Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean
     
P2272 Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean
     

1.
Problem verification:

Problem verification
?1.
Press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?4.
Test-drive under these conditions:
Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
A/T 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
    

?5.
Monitor the OBD STATUS for DTC P2270 and/or P2272* in the DTCs MENU with the HDS.
DTC Description
OBD Status
P2270 Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean
 
P2272 Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean
 

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 HDS indicates NOT COMPLETED, go to step 1-3 and recheck.
Repair verification (OBD STATUS check):

?1.
Press the engine start/stop button to select the ON mode.

?2.
Reset the PCM with the HDS.


?3.
Do the PCM idle learn procedure.

?4.
Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?5.
Test-drive under these conditions:
Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
A/T 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 and/or P2272* in the DTCs MENU with the HDS.
DTC Description
OBD Status
P2270 Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean
 
P2272 Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean
 


Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?

     
PASSED (P2270)
     
     
     
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to indicated DTC's troubleshooting.?
     
PASSED (P2272)
     
     
     
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to indicated DTC's troubleshooting.?
     
FAILED (P2270)
     
     
     
Go to step 1 and recheck.
     
FAILED (P2272)
     
     
     
Go to step 1 and recheck.
     
NOT COMPLETED
     
     
     
Meet the test condition, and check the OBD STATUS again.