DTC Troubleshooting: P1172
DTC P1172: A/F Sensor (Sensor 1) Circuit Out of Range High
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P1172 A/F Sensor (Sensor 1) Circuit Out of Range High
    

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.
Monitor the OBD STATUS for P1172 in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P1172 A/F Sensor (Sensor 1) Circuit Out of Range High
  

Does the HDS indicate FAILED?

     
YES
     
     
     
The failure is duplicated. Replace the A/F sensor (Sensor 1).?
     
NO
     
     
     
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F Sensor (Sensor 1) 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 1-4 and recheck.?